Table 2.

Chemical Control of Diseases of Woody Ornamentals

Plant & disease Suggested fungicides	Rate per 100 gal. (lbs.)¹	Application and Remarks
ALDER Powdery mildew Benomyl, 50% WP Sulfur, 95% WP	½ 2-3	Spray 2 or more times, 7 to 10 days apart. Start when disease first appears.
ALMOND See Cherry
AMELANCHIER (Shadbush, Serviceberry, Juneberry)
Cedar rusts Ferbam, 76% WP Thiram, 65-75% WP Zineb, 75% WP Mancozeb, 80% WP	2 1½-2 1 ¼-2 1 ¼-2	Spray 3 times at 10-day intervals, starting when new growth appears in the spring.
APPLE See Crabapple ARBORVITAE Phomopsls needle and twig
blight Benomyl, 50% WP	1	Only new growth is susceptible. Spray whenever new growth appears. Spray after shearing or wet weather and repeat at 10- to 14-day intervals until new growth has matured.
Coryneum twig blight (Pacific Northwest) Copper²	See label	Spray at least monthly during autumn and winter rainy seasons.
ARBUTUS See Madrone ASH Anthracnose, fungus leaf spots Copper Zineb, 75% WP Benomyl, 50% WP	See label 1 ¼-2 ½-1	Apply when buds begin to open. Repeat 10 to 14 days later. Zineb also controls rust.
AZALEA See Rhododendron
BARBERRY Bacterial leaf spot and twig blight Copper	See label	Spray 2 or 3 times, 10 days apart, beginning when new leaves appear.
BASSWOOD See Linden
BIRCH Leaf blister Copper Liquid lime-sulfur	See label 2 gal.	Spray once before buds swell in early spring.
Anthracnose Copper Zineb, 75% WP	See label 1 ¼-2	Spray twice, 10 to 14 days apart, starting at budbreak.
Rust Zineb, 75% WP Mancozeb, 80% WP	2 1 ¼-2	Spray several times at 10-day intervals. Start about a week before rust normally appears.
BUTTERSWEET Powdery mildew Benomyl, 50% WP	½-1	Make 2 or more weekly sprays. Start when disease first appears.
BOXELDER See Maple BOXWOOD Canker, fungus leaf blights or spots Copper	See label	Apply 4 times: dormant after
Liquid-lime-sulfur	2 gal.	old leaves cleaned up and before new growth starts; 10 to 14 days later; when growth is half complete; in autumn when fall growth has ceased.
Phytophthora root rot Ethazol, 30-35% Diazoben	See label See label	Apply as drench around plants to saturate the soil. Repeat at 4- to 12-week intervals during spring and autumn.
BUCKEYE See Horsechestnut
BUTTERNUT See Walnut
BUTTONBUSH Powdery mildew Benomyl, 50% WP Sulfur, 95% WP	½-1 2-3	Make several weekly sprays. Start when disease first appears.
BUTTONWOOD See Sycamore CAMELLIA Sclerotlnia flower blight PCNB, 75% WP Benomyl, 50% WP	See label See label	Drench soil surface in early November to early January. Apply 1 cup in 1 gal. water to thoroughly cover 100 sq. ft. (100 lb./450 gal./acre).
Sooty mold Suggested insecticide		Sooty mold fungi grow in honeydew secreted by aphids, scale and other insects. Spray in spring and summer for insect control.
Phytophthora root rot Ethazol, 30-35% Diazoben	See label See label	Apply as drench around plants to saturate the soil. Repeat at 4- to 12-week intervals during spring and autumn.
CATALPA Powdery mildew Piperalin Benomyl, 50% WP Sulfur, 95% WP	¼ ½-1 2-3	Spray when disease first appears. Repeat 10 to 14 days later.
Fungus leaf spots Copper	See label	If severe, spray when leaves are unfolding, leaves reach full size, and 2 weeks later.
CHAMAECY-PARIS Phytophthora root rots (Pacific Northwest) Ethazol, 30-35% Diazoben	See label See label	Drench soil around roots at 14-day intervals during April-May and again in September-October.
CHERRY, PEACH, PLUM, AMOND, MAYDAY-TREE, CHERRY PLUM, CHERRYLAUREL Black know Dodine, 65% WP Zineb, 75% WP Mancozeb, 80% WP Ferbam, 76% WP Benomyl, 50% WP	¼-1 1 ½-2 1 ½-2 2 ½-1	Spray as buds begin to swell. Repeat at pink bud, full bloom, 10 and 20 days later.
Brown rot, blossom and twig blight Benomyl, 50% WP Captan, 50% WP Sulfur, 95% WP	¼-1 2 5-10	Spray when first blossoms open, during full bloom, and again at petal-fall. Thorough coverage is required.
Leaf blister or curl, plum pockets, wltches’-broom Captan, 50% WP Liquid lime-sulfur Ferbam, 76% WP Dodine, 65% WP Copper	2 2 gal. 2 ½-1 See label	Spray once in late fall or just before buds swell in early spring. Dodine is cleared for use only on peaches for leaf leaf curl in the western states.
Coccomyces leaf spot, blight, or shot-hole Benomyl, 50% WP Dodine, 65% WP Acti-dione Captan, 50% WP	¼-1 ½-1 See label 2	Spray 3 or 4 times, 2 weeks apart. Start as buds are opening. Apply Acti-dione only to non-bearing cherry trees.
Perennial canker Ferbam, 76% WP Benomyl, 50% WP	2 ½-1	Delay pruning until buds open in spring. Spray just after pruning.
Powdery mildew Benomyl, 50% WP Karathane,	½-1	Spray when mildew first appears. Repeat once or twice at 7- to 10-day intervals.
22.5% WP Sulfur, 95% WP Acti-dione PM	½ 2-3 See label	Apply Acti-dione only to nonbearing cherry trees.
Rust Ferbam, 76% WP Zineb, 75% WP	2 1 ½-2	Spray several times, about 10 days apart. Start about 2 weeks after petal-fall.
Scab, fungus leaf spots, shot-hole Benomyl, 50% WP Sulfur, 95% WP Captan, 50% WP Ferbam, 76% WP Zineb, 75% WP	½-1 5-10 2 2 1 ½-2	Spray about 3 times, 10 to 14 days apart, starting at petalfall.
CONIFERS See Pine
COTONEASTER Fire blight Streptomycin formulations Bordeaux mixture	See label 2-6-100	Apply during bloom at 5- to 7day intervals. Do not use streptomycin on C. raceml-folia; may substitute bordeaux if temperature is above 65 deg. F.
Scab Benoyml, 50% WP Dodine, 65% WP	½-1 ½-1	Apply in spring as buds start to swell and repeat 2 to 3 weeks later.
Fungus leaf spots Maneb, 80% WP Zineb, 75% WP	1 ½-2 1 ½-2	Spray several times 10 to 14 days apart. Commence at budbreak.
CRABAPPLE, APPLE Cedar rusts (Apple, hawthorn, quince) Ferbam, 76% WP Maneb, 80% WP Mancozeb, 80% WP Thiram, 65-75% WP Zineb, 75% WP Polyram, 80% WP Scab Zineb, 75% WP Benomyl, 50% WP Sulfur, 95% WP Dodine, 65% WP Captan, 50% WP Maneb, 80% WP Mancozeb, 80% WP Polyram, 80% WP Dikar, 80% WP Folpet, 50% WP Captafol	2 1 ½-2 1 ½-2 1 ½-2 1 ½-2 1 ¼-2 1 ½-2 ½-1 6-8 ½-1 2 1 ½-2 1 ½-2 1 ½-2 2 1 ½-2 1 ½-2 pts.	Spray as new growth appears and flower buds start to open. Repeat 3 or 4 more times at 10-day intervals. Spray as new growth appears. Repeat 4 more times, 7 to 10 days apart. Thorough coverage of new growth is essential. Captafol (Difolatan 4F) is applied to apple and crabapple as a single application before bloom for control of primary scab. See label.
Fire blight Streptomycin formulations Copper	See label See label	Spray when 20 to 25% of blossoms are open and repeat at 5- to 7-day intervals during bloom. Then apply weekly for 5 or 6 weeks. Best control when spraying at night.
Powdery mildew Benomyl, 50% WP Sulfur, 95% WP Karathane, 22.5% WP	½-1 6-8 ½	Spray when disease first appears or as leaves start to expand. Repeat 2 or 3 times, 10 apart.
CRAPEMYRTLE Fungus leaf spots or blotch, black spot, tip blight Copper Zineb, 75% WP Maneb, 80% WP Mancozeb, 80% WP	See label 1 ½-2 1 ½-2 1 ½-2	Make several applications, 2 to 3 weeks apart. Start when new growth appears in the spring.
Powdery mildew Benomyl, 50% WP Karathane, 22.5% WP Sulfur, 95% WP Acti-dione PM Lime-sulfur	½-1 ½ 2-3 See label See label	Make several spring and autumn sprays. Start when disease is first seen. Apply lime-sulfur once, just as the buds are breaking open.
CURRANT, ALPINE Anthracnose and fungus leaf spots Benomyl, 50% WP Ferbam, 76% WP Maneb, 80% WP Mancozeb, 80% WP Zineb, 75% WP	½-1 2 1 ½-2 1 ½-2 1 ½-2	Spray 2 or 3 times, 10 to 14 days apart. Start at leaf emergence or when leaves are nearly expanded.
CYPRESS Coryneum blight, canker Bordeaux mixture	4-4-50	Apply in early spring and late fall at 7- to 10-day intervals.
DOGWOOD Fungus leaf spot or blotch, anthracnose, spot anthracnose, flower and leaf blight Benomyl, 50% WP Maneb, 80% WP Mancozeb, 80% WP Zineb, 75% WP Captan, 50% WP Folpet, 50% WP Copper	½-1 1½-2 1 ½-2 1 ½-2 2 1 ½-2 See label	Spray at budbreak and just before flower bracts are fully expanded. Repeat 2 or 3 more times about 2 weeks apart.
Powdery mildew Benomyl, 50% WP Sulfur, 95% WP	½-1 2-3	Spray when mildew first appears. Repeat 7 to 10 days later if needed.
DOUGLAS-FIR Needle cast Copper	See label	Spray 3 or 4 times, 10 to 14 days apart. Start when new growth appears.
ELM Anthracnose, black leaf spot, other fungus leaf spots, twig blight Sulfur, 95% WP Copper Zineb, 75% WP Mancozeb, 80% WP Ferbam, 76% WP	2-3 See label 1 ½-2 1½-2 2	Spray 3 times, 10 to 14 days apart. Start when the leaf buds break open.
Dutch elm disease Metham (Vapam Soil Fumigant) + Methoxychlor + Lignasan BLP^2A	See label See label See label	Soil treatment when disease first appears to prevent transmission by root grafts. Follow label directions. Apply just before budbread to prevent inoculation by elm bark beetles. For protective and/or therapeutic treatment. Should be applied by a trained arborist. Inject 2 gal. of solution per 4 in. of tree diameter (measured at breast height) into root flare or trunk, using multiple injection sites. Spring application at half-to-full leaf stage is preferred; or at first sign of disease.
Nectrίa canker (Pacific Northwest) Copper	See label	Spray in October and 2 or 3 times in spring, starting when new growth appears.
EUONYMUS Leaf spots Maneb, 80% WP Mancozeb, 80 WP Zineb, 75% WP	1 ½-2 1 ½-2 1 ½-2	Apply at budbreak or at first sign of disease. Spray 2 or 3 times at 7- tp 10-day intervals.
Powdery mildew Acti-dione PM Karathane, 22.5% WP Sulfur, 95% WP	See label ½-1 4-5	Apply at first evidence of disease. Repeat at 7- to 10-day intervals.
EVERGREENS See Juniper, Pine, Yew FIRETHORN See Pyracantha
FORSYTHIA Leaf spots Maneb, 80% WP Zineb, 75% WP Copper	1 ½-2 1 ½-2 See label	Apply at budbreak and repeat at 7- to 10-day intervals as needed.
GARDENIA Canker Torjam, 76% WP	See label	Mix ½ lb. of ferbam with 100 pounds of sand for cutting bed.
Leaf spots Ferbam, 76% WP Copper Powdery mildew Karathane, 22.5% WP	1½ See label ½	Spray cuttings and plants at 7- to 10-day intervals in wet weather. Apply at first sign of disease; repeat 2 or 3 times 7 to 10 days apart.
HAWTHORN, RED HAW Leaf blight or spots, scab, other fungus leaf spots Polyram, 80% WP Captan, 50% WP Benomyl, 50% WP Maneb, 80% WP Mancozeb, 80% WP Zineb, 75% WP Dodine, 65% WP Acti-dione	1 ½-2 2 ½-1 1 ½-2 1 ½-2 1 ½-2 ½ See label	Apply 4 sprays at 7- to 10-day intervals, starting as new growth appears. Extend the schedule during rainy seasons.
Cedar rusts Thiram, 6575% WP Zineb, 75% WP Maneb, 80% WP Mancozeb, 80% WP Chlorothalonil, 75% WP	1 ½-2 1 ½-2 1 ½-2 1 ½-2 1 ½-2	Spray as new growth appears and flower buds start to open. Repeat 3 or 4 times at 7- to 10-day intervals.
Fire blight Streptomycin : formulations	See label	Spray when 20 to 25% of blossoms are open and at 5- to 7-day intervals during bloom. Do not use streptomycin on C. mollis.
HEATHER (Calluna) Botrytis blight Benomyl, 50% WP Phytophthora root rot Ethazol, 30-35% Diazoben	¼-1 See label See label	Drench when symptoms appear; repeat if Botrytis reappears. Drench soil around plants at 2- to 4-week intervals during spring and autumn rainy periods.
HIBISCUS Powdery mildew Sulfur, 95% WP	2-3	Apply at first sign of disease and repeat 2 or 3 times at weekly intervals.
HICKORY Anthracnose, fungus leaf spot or blotch, scab, spot anthracnose Benomyl, 50% WP Zineb, 75% WP Mancozeb, 80% WP Maneb, 80% WP	½-1 1 ½-2 1 ¼-2 1 ½-2	Spray 3 or 4 times, 7 to 10 days apart, starting when the buds break open.
HOLLY Fungus leaf spots, tar spot, anthracnose, spot anthracnose Benomyl, 50% WP Zineb, 75% WP Maneb, 80% WP Mancozeb, 80% WP Copper	½-1 1 ½-2 1 ½-2 1 ½-2 See label	Apply 3 or 4 sprays at 10- to 14-day intervals. Start as leaves begin to unfold. Some holly species and cultivars are sensitive to copper materials in cold damp weather.
Leaf and twig blight, algae Copper Zineb, 75% WP	See label 1 ½-2	Spray 3 or 4 times, 10 days apart. Start with the first autumn rains.
Powdery mildew Sulfur, 95% WP	2-3	Apply at first disease appearance. Repeat at 7-day intervals as needed.
HONEYSUCKLE Herpobasldium leaf blight Mancozeb, 80% WP Maneb, 80% WP Powdery mildew	1½-2 1 ½-2	Apply several sprays 7 to 10 days apart. Start when new growth appears.
Benomyl, 50% WP Sulfur, 95% WP Acti-dione PM	¼-1 2-3 See label	Spray 2 or more times at weekly intervals. Start when disease first appears.
HORSECHESTNUT, BUCKEYE Leaf blotch, fungus leaf spot or blotch, anthracnose Benomyl, 50% WP Zineb, 75% WP Mancozeb, 80% WP Maneb, 80% WP Dodine, 65% WP	½-1 1 ½-2 1 ½-2 1 ½-2 1-2	Spray 3 or 4 times, 10 to 14 days apart, starting as the buds begin to open. Thorough coverage is required.
HYDRANGEA Fungus leaf spots, rust Zineb, 75% WP Ferbam, 76% WP Powdery mildew Benomyl, 50% WP Karathane, 22.5% WP Sulfur, 95% WP Botrytis blight Benomyl, 50% WP Botran, 50% WP	1 ½-2 2 ½-1 ½ 2-3 ¼-1 1-1 ½	Spray 3 times, 7 to 10 days apart. Start when new growth appears. Spray several times, 7 to 10 days apart. Start when disease first appears. Spray when first symptoms appear. Repeat twice weekly during rainy periods.
JUNEBERRY See Amelanchier JUNIPER, REDCEDAR Rusts Zineb, 75% WP Acti-dione Ferbam, 76% WP	1 ½-2 See label 2	Spray susceptible junipers 4 times, 10 to 20 days apart, starting about mid-summer. Acti-dione is applied in spring before galls become orange and jelly-like.
Phomopsls canker or twig blight Benomyl, 50% WP	1	Spray several times at 10- to 14-day intervals. Keep new growth protected. See Arborvitae.
Cercospora needle blight Copper	See label	Spray when disease first appears or after June 1; repeat twice more at 2- to 3-week intervals.
KALANCHOË Powdery mildew Benomyl, 50% WP	½-1	Spray several times at 7- to 10-day intervals. Start when disease first appears.
LAUREL See Mountain-laurel
LILAC Powdery mildew Benomyl, 50% WP Sulfur, 95% WP Karathane, 22.5% WP	½-1 4-6 ½-1	Spray several times at 7- to 10-day intervals. Start when disease first appears. If using benomyl, apply at 3-week intervals.
Bacterial and Phytophthora blights Copper	See label	Spray 2 or 3 times at 7- to 10-day intervals. Start when new growth appears in spring.
LINDEN, BASSWOOD Anthracnose, fungus leaf spots, leaf blight, spot anthracnose Copper: Benomyl, 50% WP Powdery mildew Benomyl, 50% WP Sulfur, 95% WP	See label ½-1 ¼-1 2-3	Spray just after budbreak and again 10 and 20 days later. Spray when mildew first appears. Repeat 10 days later.
MADRONE (Arbutus) Hendersonula canker Zineb, 75% WP plus Ferbam, 76% WP	1 1	Spray when disease is first noticed and repeat 10 to 14 later.
Fungus leaf spots Captan, 50% WP Zineb, 75% WP Maneb, 80% WP Mancozeb, 80% WP Thiram, 6575% WP Dodine, 65% WP	2 1¼-2 1 ½-2 1 ½-2 1 ½-2 ½-2	Usually not needed except in rainy seasons. Apply several sprays at 7- to 10-day intervals.
MAGNOLIA Powdery mildews Benomyl, 50% WP Acti-dione PM	½-1 See label	Spray 2 or 3 times, 7 to 10 days apart. Start when disease first appears.
MAPLE, BOXELDER Anthracnose, fungus leaf spots, leaf blight or blotch, leaf scab, tar spot, leaf blister Copper Zineb, 75% WP Mancozeb, 80% WP Maneb, 80% WP	See label 1½•2 1 ½-2 1 ½-2	Spray 3 times, 10 to 14 days apart, starting as the buds begin to open.
Nectrla canker (Pacific Northwest) Copper	See label	Spray once in October and 2 or 3 times in spring starting when growth commences.
MAYDAYTREE See Cherry MOUNTAINASH Leaf blight, scab,fungus leaf spots Benomyl, 50% WP Mancozeb, 80% WP Zineb, 75% WP Rust Zineb, 75% WP	¼-1 1 ½-2 1 ½-2 1 ½-2	Spray 2 to 4 times, 14 days apart, starting as the leaf buds open. Apply 4 or 5 sprays, 10 days apart, starting as flower buds open.
Fire blight Streptomycin formulations Copper	See label See label	Spray when 20 to 25 percent of blossoms are open and and again at full bloom.
MOUNTAINLAUREL, LAUREL (Kalmia) Fungus leaf spots, leaf blight Benomyl, 50% WP Copper Ferbam, 76% WP	1 See label 2	Spray 3 times starting at budbreak. Repeat 10 and 20 days later.
MULBERRY Bacterial blight Bordeaux mixture	5-5-100	Apply at budbreak and repeat at 7-day intervals during moist periods.
NEW JERSEY TEA (Ceanothus) Powdery mildew Benomyl, 50% WP	½-1	Make several sprays 7 to 10 days apart. Start when disease appears.
OAK Anthracnose, fungus leaf spots and and blights, spot anthracnose, leaf blotch, leaf blister Copper Zineb, 75% WP Captan, 50% WP Benomyl, 50% WP Dodine, 65% WP Mancozeb, 80% WP	See label 1 ¼-2 2-4 1 1 1 ½-2	Spray 3 times: just before buds open, when leaves are half grown, and 10 to 14 days later.
Oak Wilt 2,4,5-T³	4 lbs. a.i./ gal. oil	Apply to deep girdle and axe cuts in roots to runoff before 50% wilt of tree develops. Treatment kills infected trees and prevents spread to healthy oaks.
Metham (Vapam Soil Fumigant)	See label	Soil treatment when disease first appears to prevent transmission to healthy oaks by root grafts. Follow label directions.
PEACH See Cherry PEAR Fire blight Streptomycin formulations	See label	Spray when 20 to 25% of blossoms are open and repeat at 5- to 7-day intervals during bloom. Then apply weekly for 5 or 6 weeks. Best control when spraying at night.
Scab Several fungicides		See Scab under Crabapple.
Leaf spot Benomyl, 50% WP Ferbam, 76% WP Mancozeb, 80% WP Dodine, 65% WP Zineb, 75% WP	½-1 2 1½-2 ½-1 1 ½-2	Spray 2 or 3 times, 10 days apart, starting at budbreak.
PECAN Scab, fungus leaf spots, leaf blotch and scorch, spot anthracnose, anthracnose Benomyl, 50% WP Zineb, 75% WP Maneb, 80% WP Mancozeb, 80% WP Dodine, 65% WP Copper Polyram, 80% WP Du-Ter, 47.5% WP Powdery mildew Benomyl, 50% WP Du-Ter, 47.5% WP	½-1 1 ½-2 1 ½-2 1 ¼-2 ½-1 See label 2 ½ ½-1 ¼-¼	Apply 4 to 6 sprays, 10 to 14 days apart. Start when buds begin to open. Thorough coverage is required. Follow manufacturer’s directions. Spray when mildew is first seen. Repeat at 10- to 14-day intervals.
PHOTINIA Powdery mildew Benomyl, 50% Wp Sulfur, 95% WP	½-1 2-3	Spray several times at 10- to 14-day intervals. Start when new leaf growth or disease first appears.
PINE Dothlstroma needle blight Copper	See label	Spray twice: when new needles are just emerging and again when new needles are fully expanded.
Sclrrhia brown spot needle blight Copper Mancozeb, 80% WP Maneb, 80% WP Chlorothalonil Daconil 2787 Bravo 6F	See label 1 ½-2 1 ¼-2 1 ½-2 3 qts.	Spray once or twice, 30 days apart, starting when new needles are half-grown. If rainy, spray at 2-week intervals.
Lophodermlum needle cast or blight Mancozeb, 80% WP Maneb, 80% WP Chlorothalonil Daconil 2787 Bravo 6F Copper	1 ½-2 1 ½-2 2½ 2½ pts. See label	Spray 4 times, 2 to 3 weeks apart, starting about midsummer when the new needdies are full-grown.
Dlplodia tip blight Copper Benomyl, 50% WP	See label 1	Spray twice, 10 to 14 days apart. Start as buds open.
Fusiform rust (nurseries in southern states) Ferbam, 76% WP	2	Spray seedlings at 5-day intervals after emergence; continue to about July 1.
Scleroderrls canker Chlorothalonil Bravo 6F	1 ½ qts.	Spray as new growth appears in spring. Repeat at 2- to 3-week intervals until early July; then monthly until early September.
Sirococcus tip blight and Phoma spp. (West Coast only) Chlorothalonil Bravo 6F	1 qt.	Start spraying in early November and repeat at 2- to 4-week intervals during the autumn and winter rainy period.
Annosus root and butt rot Borax, 97% (dry, powdered)	1 Ib./50sq. ft. of stump surface	Cover fresh cut stump surface immediately after falling tree. Sprinkle liberally and evenly.
Cyllndro-cladium blight Benomyl, 50% WP Ferbam, 76% WP Damping-off Ethazol, 30-35% PCNB	½ 2 See label See label	Apply as a soil drench to seedling beds at 2- to 4-week intervals. Drench around plants in nursery beds at 2- to 4-week intervals. Drench nursery beds of southern pines prior to seeding. Follow with 0.5 inch of water.
PLANETREE See Sycamore
PLUM See Cherry
POPLAR Leaf rusts Zineb, 75% WP	2	Spray about a week before rust is expected and again 10 to 14 days later.
Yellow leaf blister Zineb, 75% WP Mancozeb, 80% WP Maneb, 80% WP	2 2 2	Apply several weekly sprays when spots first appear on the lower leaves.
Powdery mildew Sulfur, 95% WP	4¼-5½	Apply at first sign of disease. Repeat 2 or 3 times at 5- to 10-day intervals.
PRIVET Anthracnose, leaf spot, twig blight Ferbam, 76% WP Benomyl, 50% WP	2 1	Spray several times at 10-day intervals, starting in midspring.
PYRACANTHA (Firethorn) Fire blight Streptomycin formulations Copper	See label See label	Spray when 20 to 25% of blossoms are open and repeat at 5- to 7-day intervals during bloom.
Scab Benomyl, 50% WP Folpet, 50% WP Dodine, 65% WP	1 2 ½-1	Spray 4 times: just before blossoms open, petal-fall, 2 weeks and 4 weeks later.
QUINCE Fire blight Bordeaux mixture	2-6-100	Spray when 20 to 25% of the blossoms are open; repeat when 75% of blooms are open. Do not use streptomycin on quince.
Rust, scab, fungus leaf spots Maneb, 80% WP Mancozeb, 80% WP Ferbam, 76% WP Zineb, 75% WP	1 ½-2 1 ½-2 2 1 ½-2	Apply several times at 10-day intervals starting at budbreak.
REDBUD Cercospora and other fungus leaf spots Captan, 50% WP Maneb, 80% WP Zineb, 75% WP	2 1 ½-2 2	Apply at budbreak and repeat several times at 10-day intervals during the spring rainy period.
REDCEDAR See Juniper RED HAW See Hawthorn RHODODEN DRON, AZALEA Ovullnla petal or flower blight of azalea Benomyl, 50% WP Zineb, 75% WP Mancozeb, 80% WP Thiram, 65-75% WP	½ 1 1 1	Spray as flowers open. Then apply benomyl at 5-day intervals, zineb, mancozeb, and thiram 3 times weekly during the bloom period.
Powdery mildew Benomyl, 50% WP Sulfur, 95% WP Karathane, 22.5% WP	½-1 3-6 ½-1	Spray several times at 7- to 10-day intervals. Start when disease first appears.
Fungus leaf spots, rusts Zineb, 75% WP Maneb, 80% WP Mancozeb, 80% WP Benomyl, 50% WP Ferbam, 76% WP	1 ½-2 1 ½-2 1 ½-2 ½-1	Spray several times at 7- to 10-day intervals. Start when new growth appears or right after bloom. Zineb, maneb, mancozeb, and ferbam are effective against rusts.
Leaf, flower and stem gall Zineb, 75% WP Ferbam, 76% WP	½-1 1½ 2	Spray just before budbreak and continue as for Fungus leaf spots.
Bud and twig blight, dieback Copper	See label	Make 3 sprays, 7 to 10 days apart, starting at budbreak.
Root and crown rot or wilt (Phytophthora cinnamomi and other fungi) Ethazol, 30-35% Diazoben	See label See label See label	Apply as drench around plants to saturate the soil. Repeat at at 4- to 12-week intervals during spring and autumn.
Cutting rot Benomyl, 50% WP Ethazol, 30-35%	See label	Mix 1 part benomyl with 39 parts of root-inducing hormone powder by weight. Treat cutting ends with mixture before "sticking” in rooting medium. Then drench soil as for Root and crown rot or wilt (above). Apply as for Root and crown rot or wilt (above).
ROSE Botrytis blight Benomyl, 50% WP Botran, 5075% WP Zineb, 75% WP	½ See label 1	Apply to flowers at 7- to 10-day intervals during moist weather.
Black spot, cane blights or cankers, spot anthracnose, anthracnose, fungus leaf spots Chlorothalonil, 75% WP Folpet, 50% WP Maneb, 80% WP Mancozeb, 80% WP Polyram, 80% WP Benomyl, 50% WP Zineb, 75% WP	1 ½-2 1 ½-2 ⁵ 1 ½-2 1 ½-2 1 ¼-2 1 1 ½-2	Spray at 7- to 10-day intervals, starting when new growth appears. Shorten spray interval to 5 or 7 days during rainy weater maneb, mancozeb, Polyram, zineb and chlorothalonil also control rusts.
Powdery mildew Benomyl, 50% WP Folpet, 50% WP Karathane, 22.5% WP Sulfur, 95% WP Acti-dione Parinol Piperalin	½-1 1 ½-2 ¼-1 2-3 See label See label See label	Spray at 7- to 10-day intervals, starting when new growth appears. Thorough coverage Thorough coverage is required
SERVICEBERRY SHADBUSH See Amelanchier SPRUCE See Pine SUMAC Fungus leaf spots Maneb, 80% WP Sulfur, 95% WP	1 ½-2 4-6	Apply when disease is first seen. Repeat as needed at 7-to 10-day intervals during wet periods.
SYCAMORE, PLANETREE, BUTTONWOOD Anthracnose⁴, fungus leaf spots, leaf blight Benomyl, 50% WP Copper Mancozeb, 80% WP Maneb, 80% WP Dodine, 65% WP Captafol Zineb, 75% WP	1 See label 1 ½-2 1 ½-2 1 2 pts. 1 ½-2	Spray 3 times, 10 days apart, starting just before budbreak. Thorough coverage is required
Powdery mildew Benomyl, 50% WP Sulfur, 95% WP TAXUS See Yew	½-1 2-3	Spray 2 or 3 times, 7 to 10 days apart, starting when disease first appears.
VIBURNUM Powdery mildew Benomyl, 50% WP Sulfur, 95% WP Karathane, 22.5% WP	½-1 1½ ½	Spray 2 or more times, 7 to 10 days apart. Start when disease first appears. Some viburnums are sensitive to sulfur.
WALNUT, BUTTERNUT Anthracnose, yellow leaf blotch, fungus leaf spots or blights Benomyl, 50% WP Dodine, 65% WP Zineb, 75% WP Mancozeb, 80% WP Maneb, 80% WP	¼-1 ½-1 1 ½-2 1 ½-2 1 ½-2	Spray 3 or 4 times at 2-week intervals, starting when the leaves begin to unfold. Thorough coverage is required.
Bacterial blight (of Persian or English walnut) Copper Streptomycin formulations	See label See label	Spray 3 times: when flowering starts, at full bloom, and at petal-fall.
WILLOW Tar spot, leaf blight or scab, black canker, spot anthracnose Copper Zineb, 75% WP Man cozeb, 80% WP Maneb, 80% WP Dodine, 65% WP	See label 1 ½-2 1 ½-2 1 ½-2 ½-1	Spray 3 times, 10 days apart, starting as the buds open. Zineb, maneb and mancozeb also control rust.
Powdery mildew and rusl Sulfur, 95% WP	t 4½-5½	Apply 2 or more times, 7 to 10 days apart. Start when disease first appears.
WITCH HAZEL Powdery mildew Benomyl, 50% WP YEW (Taxus) Phytophthora root rot (Pacific Northwest) Ethazol, 30-35% Diazoben Twig blight Bordeaux mixture	½-1 See label See label 4-4-100	Spray 2 or more times, 7 to 10 days apart. Start when disease appears. Drench soil around plants at 2- to 4-week intervals during April-May and again in September-October. Apply when new growth emerges. Repeat twice more at 7- to 10-day intervals.
ALL TREES AND SHRUBS Seed decay, damping-off, seedling blights Thiram, 5075% WP Captan, 5075% WP Mylone, DMTT Diazoben	i See label See label	Apply 2 oz./lb. of seed. If damping-off occurs, drench seedbed (4 T./gal.) when first seen. Follow label directions. Apply as a soil drench 2 to 3 weeks prior to planting in nursery beds. Apply as a soil drench after plants are set; repeat at 2- to 4-week intervals.
Wood rots or decays Thiram, 75% WP Copper naphthenate Benomyl, 50% WP Sodium o-phenylphenate	¹ 1% 3.3-10.0% ½t./gal. > 2%	Apply thinly in an asphalt or other non-fortified tree wound preparation.

Plant & disease

Suggested fungicides

Rate per 100 gal. (lbs.)¹

Application and Remarks

ALDER Powdery mildew

Benomyl, 50% WP

Sulfur, 95% WP

2-3

Spray 2 or more times, 7 to 10 days apart. Start when disease first appears.

ALMOND

See Cherry

AMELANCHIER

(Shadbush, Serviceberry, Juneberry)

Cedar rusts

Ferbam, 76% WP

Thiram, 65-75% WP

Zineb, 75% WP

Mancozeb, 80% WP

1½-2

1 ¼-2

Spray 3 times at 10-day intervals, starting when new growth appears in the spring.

APPLE

See Crabapple ARBORVITAE

Phomopsls needle and twig

blight

Benomyl, 50% WP

Only new growth is susceptible. Spray whenever new growth appears. Spray after shearing or wet weather and repeat at 10- to 14-day intervals until new growth has matured.

Coryneum twig blight (Pacific Northwest) Copper²

See label

Spray at least monthly during autumn and winter rainy seasons.

ARBUTUS

See Madrone

ASH Anthracnose, fungus leaf spots

Copper

Zineb, 75% WP

Benomyl, 50% WP

See label 1 ¼-2

½-1

Apply when buds begin to open. Repeat 10 to 14 days later. Zineb also controls rust.

AZALEA

See Rhododendron

BARBERRY Bacterial leaf spot and twig blight

Copper

See label

Spray 2 or 3 times, 10 days apart, beginning when new leaves appear.

BASSWOOD See Linden

BIRCH Leaf blister Copper

Liquid lime-sulfur

See label 2 gal.

Spray once before buds swell in early spring.

Anthracnose

Copper

Zineb, 75% WP

See label

1 ¼-2

Spray twice, 10 to 14 days apart, starting at budbreak.

Rust

Zineb, 75% WP

Mancozeb, 80% WP

1 ¼-2

Spray several times at 10-day intervals. Start about a week before rust normally appears.

BUTTERSWEET Powdery mildew

Benomyl, 50% WP

½-1

Make 2 or more weekly sprays. Start when disease first appears.

BOXELDER

See Maple

BOXWOOD Canker, fungus leaf blights or spots Copper

See label

Apply 4 times: dormant after

Liquid-lime-sulfur

2 gal.

old leaves cleaned up and before new growth starts; 10 to 14 days later; when growth is half complete; in autumn when fall growth has ceased.

Phytophthora root rot

Ethazol, 30-35%

Diazoben

See label

Apply as drench around plants to saturate the soil. Repeat at 4- to 12-week intervals during spring and autumn.

BUCKEYE

See

Horsechestnut

BUTTERNUT See Walnut

BUTTONBUSH Powdery mildew

Benomyl, 50% WP

Sulfur, 95% WP

½-1

2-3

Make several weekly sprays. Start when disease first appears.

BUTTONWOOD See Sycamore CAMELLIA Sclerotlnia flower blight PCNB, 75% WP

Benomyl, 50% WP

See label

Drench soil surface in early November to early January. Apply 1 cup in 1 gal. water to thoroughly cover 100 sq. ft. (100 lb./450 gal./acre).

Sooty mold

Suggested insecticide

Sooty mold fungi grow in honeydew secreted by aphids, scale and other insects. Spray in spring and summer for insect control.

Phytophthora root rot

Ethazol, 30-35%

Diazoben

See label

Apply as drench around plants to saturate the soil. Repeat at 4- to 12-week intervals during spring and autumn.

CATALPA Powdery mildew

Piperalin

Benomyl, 50% WP

Sulfur, 95% WP

½-1

2-3

Spray when disease first appears. Repeat 10 to 14 days later.

Fungus leaf spots Copper

See label

If severe, spray when leaves are unfolding, leaves reach full size, and 2 weeks later.

CHAMAECY-PARIS Phytophthora root rots

(Pacific Northwest)

Ethazol, 30-35% Diazoben

See label

Drench soil around roots at 14-day intervals during April-May and again in September-October.

CHERRY, PEACH, PLUM, AMOND, MAYDAY-TREE, CHERRY PLUM, CHERRYLAUREL Black know Dodine, 65% WP

Zineb, 75% WP

Mancozeb, 80% WP

Ferbam, 76% WP

Benomyl, 50% WP

¼-1

1 ½-2

½-1

Spray as buds begin to swell. Repeat at pink bud, full bloom, 10 and 20 days later.

Brown rot, blossom and twig blight

Benomyl, 50% WP

Captan, 50% WP

Sulfur, 95% WP

¼-1

5-10

Spray when first blossoms open, during full bloom, and again at petal-fall. Thorough coverage is required.

Leaf blister or curl, plum pockets, wltches’-broom

Captan, 50% WP

Liquid lime-sulfur

Ferbam, 76% WP

Dodine, 65% WP

Copper

2 gal.

½-1

See label

Spray once in late fall or just before buds swell in early spring. Dodine is cleared for use only on peaches for leaf leaf curl in the western states.

Coccomyces leaf spot, blight, or shot-hole

Benomyl, 50% WP

Dodine, 65% WP

Acti-dione

Captan, 50% WP

¼-1

½-1

See label

Spray 3 or 4 times, 2 weeks apart. Start as buds are opening. Apply Acti-dione only to non-bearing cherry trees.

Perennial canker Ferbam, 76% WP

Benomyl, 50% WP

½-1

Delay pruning until buds open in spring. Spray just after pruning.

Powdery mildew

Benomyl, 50% WP

Karathane,

½-1

Spray when mildew first appears. Repeat once or twice at 7- to 10-day intervals.

22.5% WP

Sulfur, 95% WP

Acti-dione PM

2-3

See label

Apply Acti-dione only to nonbearing cherry trees.

Rust

Ferbam, 76% WP

Zineb, 75% WP

1 ½-2

Spray several times, about 10 days apart. Start about 2 weeks after petal-fall.

Scab, fungus leaf spots, shot-hole

Benomyl, 50% WP

Sulfur, 95% WP

Captan, 50% WP

Ferbam, 76% WP

Zineb, 75% WP

½-1

5-10

1 ½-2

Spray about 3 times, 10 to 14 days apart, starting at petalfall.

CONIFERS

See Pine

COTONEASTER Fire blight Streptomycin formulations

Bordeaux mixture

See label

2-6-100

Apply during bloom at 5- to 7day intervals. Do not use streptomycin on C. raceml-folia; may substitute bordeaux if temperature is above 65 deg. F.

Scab

Benoyml, 50% WP

Dodine, 65% WP

½-1

Apply in spring as buds start to swell and repeat 2 to 3 weeks later.

Fungus leaf spots

Maneb, 80% WP

Zineb, 75% WP

1 ½-2

Spray several times 10 to 14 days apart. Commence at budbreak.

CRABAPPLE, APPLE

Cedar rusts (Apple, hawthorn, quince)

Ferbam, 76% WP

Maneb, 80% WP

Mancozeb, 80% WP

Thiram, 65-75% WP

Zineb, 75% WP

Polyram, 80% WP

Scab

Zineb, 75% WP

Benomyl, 50% WP

Sulfur, 95% WP

Dodine, 65% WP

Captan, 50% WP

Maneb, 80% WP

Mancozeb, 80% WP

Polyram, 80% WP

Dikar, 80% WP

Folpet, 50% WP

Captafol

1 ½-2

1 ¼-2

1 ½-2

½-1

6-8

½-1

1 ½-2

1 ½-2 pts.

Spray as new growth appears and flower buds start to open. Repeat 3 or 4 more times at 10-day intervals.

Spray as new growth appears. Repeat 4 more times, 7 to 10 days apart. Thorough coverage of new growth is essential. Captafol (Difolatan 4F) is applied to apple and crabapple as a single application before bloom for control of primary scab. See label.

Fire blight Streptomycin formulations Copper

See label

Spray when 20 to 25% of blossoms are open and repeat at 5- to 7-day intervals during bloom. Then apply weekly for 5 or 6 weeks. Best control when spraying at night.

Powdery mildew

Benomyl, 50% WP

Sulfur, 95% WP

Karathane, 22.5% WP

½-1

6-8

Spray when disease first appears or as leaves start to expand. Repeat 2 or 3 times, 10 apart.

CRAPEMYRTLE Fungus leaf spots or blotch, black spot, tip blight

Copper Zineb, 75% WP

Maneb, 80% WP

Mancozeb, 80% WP

See label

1 ½-2

Make several applications, 2 to 3 weeks apart. Start when new growth appears in the spring.

Powdery mildew

Benomyl, 50% WP

Karathane, 22.5% WP

Sulfur, 95% WP

Acti-dione PM

Lime-sulfur

½-1

2-3

See label

Make several spring and autumn sprays. Start when disease is first seen. Apply lime-sulfur once, just as the buds are breaking open.

CURRANT, ALPINE Anthracnose and fungus leaf spots Benomyl, 50% WP

Ferbam, 76% WP

Maneb, 80% WP

Mancozeb, 80% WP

Zineb, 75% WP

½-1

1 ½-2

Spray 2 or 3 times, 10 to 14 days apart. Start at leaf emergence or when leaves are nearly expanded.

CYPRESS Coryneum blight, canker Bordeaux mixture

4-4-50

Apply in early spring and late fall at 7- to 10-day intervals.

DOGWOOD Fungus leaf spot or blotch, anthracnose, spot anthracnose, flower and leaf blight

Benomyl, 50% WP

Maneb, 80% WP

Mancozeb, 80% WP

Zineb, 75% WP

Captan, 50% WP

Folpet, 50% WP

Copper

½-1

1½-2

1 ½-2

See label

Spray at budbreak and just before flower bracts are fully expanded. Repeat 2 or 3 more times about 2 weeks apart.

Powdery mildew

Benomyl, 50% WP

Sulfur, 95% WP

½-1

2-3

Spray when mildew first appears. Repeat 7 to 10 days later if needed.

DOUGLAS-FIR Needle cast Copper

See label

Spray 3 or 4 times, 10 to 14 days apart. Start when new growth appears.

ELM Anthracnose, black leaf spot, other fungus leaf spots, twig blight

Sulfur, 95% WP

Copper

Zineb, 75% WP

Mancozeb, 80% WP

Ferbam, 76% WP

2-3

See label

1 ½-2

1½-2

Spray 3 times, 10 to 14 days apart. Start when the leaf buds break open.

Dutch elm disease

Metham (Vapam

Soil Fumigant) +

Methoxychlor +

Lignasan BLP^2A

See label

Soil treatment when disease first appears to prevent transmission by root grafts. Follow label directions.

Apply just before budbread to prevent inoculation by elm bark beetles.

For protective and/or therapeutic treatment. Should be applied by a trained arborist. Inject 2 gal. of solution per 4 in. of tree diameter (measured at breast height) into root flare or trunk, using multiple injection sites. Spring application at half-to-full leaf stage is preferred; or at first sign of disease.

Nectrίa canker

(Pacific Northwest)

Copper

See label

Spray in October and 2 or 3 times in spring, starting when new growth appears.

EUONYMUS Leaf spots Maneb, 80% WP

Mancozeb, 80 WP

Zineb, 75% WP

1 ½-2

Apply at budbreak or at first sign of disease. Spray 2 or 3 times at 7- tp 10-day intervals.

Powdery mildew

Acti-dione PM

Karathane, 22.5% WP

Sulfur, 95% WP

See label

½-1

4-5

Apply at first evidence of disease. Repeat at 7- to 10-day intervals.

EVERGREENS

See Juniper, Pine, Yew FIRETHORN

See Pyracantha

FORSYTHIA Leaf spots Maneb, 80% WP

Zineb, 75% WP

Copper

1 ½-2

See label

Apply at budbreak and repeat at 7- to 10-day intervals as needed.

GARDENIA

Canker

Torjam, 76% WP

See label

Mix ½ lb. of ferbam with 100 pounds of sand for cutting bed.

Leaf spots

Ferbam, 76% WP

Copper

Powdery mildew

Karathane, 22.5% WP

1½

See label

Spray cuttings and plants at 7- to 10-day intervals in wet weather.

Apply at first sign of disease; repeat 2 or 3 times 7 to 10 days apart.

HAWTHORN, RED HAW Leaf blight or spots, scab, other fungus leaf spots

Polyram, 80% WP

Captan, 50% WP

Benomyl, 50% WP

Maneb, 80% WP

Mancozeb, 80% WP

Zineb, 75% WP

Dodine, 65% WP

Acti-dione

1 ½-2

½-1

1 ½-2

See label

Apply 4 sprays at 7- to 10-day intervals, starting as new growth appears. Extend the schedule during rainy seasons.

Cedar rusts

Thiram, 6575% WP

Zineb, 75% WP

Maneb, 80% WP

Mancozeb, 80% WP

Chlorothalonil, 75% WP

1 ½-2

Spray as new growth appears and flower buds start to open. Repeat 3 or 4 times at 7- to 10-day intervals.

Fire blight

Streptomycin : formulations

See label

Spray when 20 to 25% of blossoms are open and at 5- to 7-day intervals during bloom. Do not use streptomycin on C. mollis.

HEATHER

(Calluna)

Botrytis blight

Benomyl, 50% WP

Phytophthora root rot

Ethazol,

30-35% Diazoben

¼-1

See label

Drench when symptoms appear; repeat if Botrytis reappears.

Drench soil around plants at 2- to 4-week intervals during spring and autumn rainy periods.

HIBISCUS Powdery mildew

Sulfur, 95% WP

2-3

Apply at first sign of disease and repeat 2 or 3 times at weekly intervals.

HICKORY Anthracnose, fungus leaf spot or blotch, scab, spot anthracnose

Benomyl, 50% WP

Zineb, 75% WP

Mancozeb, 80% WP

Maneb, 80% WP

½-1

1 ½-2

1 ¼-2

1 ½-2

Spray 3 or 4 times, 7 to 10 days apart, starting when the buds break open.

HOLLY Fungus leaf spots, tar spot, anthracnose, spot anthracnose

Benomyl, 50% WP

Zineb, 75% WP

Maneb, 80% WP

Mancozeb, 80% WP

Copper

½-1

1 ½-2

See label

Apply 3 or 4 sprays at 10- to 14-day intervals. Start as leaves begin to unfold. Some holly species and cultivars are sensitive to copper materials in cold damp weather.

Leaf and twig blight, algae Copper

Zineb, 75% WP

See label

1 ½-2

Spray 3 or 4 times, 10 days apart. Start with the first autumn rains.

Powdery mildew

Sulfur, 95% WP

2-3

Apply at first disease appearance. Repeat at 7-day intervals as needed.

HONEYSUCKLE Herpobasldium leaf blight Mancozeb, 80% WP

Maneb, 80% WP

Powdery mildew

1½-2

1 ½-2

Apply several sprays 7 to 10 days apart. Start when new growth appears.

Benomyl, 50% WP

Sulfur, 95% WP

Acti-dione PM

¼-1

2-3

See label

Spray 2 or more times at weekly intervals. Start when disease first appears.

HORSECHESTNUT, BUCKEYE Leaf blotch, fungus leaf spot or blotch, anthracnose Benomyl, 50% WP

Zineb, 75% WP

Mancozeb, 80% WP

Maneb, 80% WP

Dodine, 65% WP

½-1

1 ½-2

1-2

Spray 3 or 4 times, 10 to 14 days apart, starting as the buds begin to open. Thorough coverage is required.

HYDRANGEA Fungus leaf spots, rust Zineb, 75% WP

Ferbam, 76% WP

Powdery mildew

Benomyl, 50% WP

Karathane, 22.5% WP

Sulfur, 95% WP

Botrytis blight Benomyl, 50% WP

Botran, 50% WP

1 ½-2

½-1

2-3

¼-1

1-1 ½

Spray 3 times, 7 to 10 days apart. Start when new growth appears.

Spray several times, 7 to 10 days apart. Start when disease first appears.

Spray when first symptoms appear. Repeat twice weekly during rainy periods.

JUNEBERRY

See Amelanchier

JUNIPER, REDCEDAR Rusts

Zineb, 75% WP

Acti-dione Ferbam, 76% WP

1 ½-2

See label

Spray susceptible junipers 4 times, 10 to 20 days apart, starting about mid-summer. Acti-dione is applied in spring before galls become orange and jelly-like.

Phomopsls canker or twig blight

Benomyl, 50% WP

Spray several times at 10- to 14-day intervals. Keep new growth protected. See Arborvitae.

Cercospora needle blight

Copper

See label

Spray when disease first appears or after June 1; repeat twice more at 2- to 3-week intervals.

KALANCHOË Powdery mildew

Benomyl, 50% WP

½-1

Spray several times at 7- to 10-day intervals. Start when disease first appears.

LAUREL

See

Mountain-laurel

LILAC Powdery mildew

Benomyl, 50% WP

Sulfur, 95% WP

Karathane, 22.5% WP

½-1

4-6

½-1

Spray several times at 7- to 10-day intervals. Start when disease first appears. If using benomyl, apply at 3-week intervals.

Bacterial and Phytophthora blights Copper

See label

Spray 2 or 3 times at 7- to 10-day intervals. Start when new growth appears in spring.

LINDEN, BASSWOOD Anthracnose, fungus leaf spots, leaf blight, spot anthracnose

Copper:

Benomyl, 50% WP

Powdery mildew

Benomyl, 50% WP

Sulfur, 95% WP

See label

½-1

¼-1

2-3

Spray just after budbreak and again 10 and 20 days later.

Spray when mildew first appears. Repeat 10 days later.

MADRONE

(Arbutus) Hendersonula canker

Zineb, 75% WP

plus

Ferbam, 76% WP

Spray when disease is first noticed and repeat 10 to 14 later.

Fungus leaf spots

Captan, 50% WP

Zineb, 75% WP

Maneb, 80% WP

Mancozeb, 80% WP

Thiram, 6575% WP

Dodine, 65% WP

2 1¼-2

1 ½-2

½-2

Usually not needed except in rainy seasons. Apply several sprays at 7- to 10-day intervals.

MAGNOLIA Powdery mildews

Benomyl, 50% WP

Acti-dione PM

½-1

See label

Spray 2 or 3 times, 7 to 10 days apart. Start when disease first appears.

MAPLE, BOXELDER Anthracnose, fungus leaf spots, leaf blight or blotch, leaf scab, tar spot, leaf blister Copper

Zineb, 75% WP

Mancozeb, 80% WP

Maneb, 80% WP

See label

1½•2

1 ½-2

Spray 3 times, 10 to 14 days apart, starting as the buds begin to open.

Nectrla canker

(Pacific Northwest)

Copper

See label

Spray once in October and 2 or 3 times in spring starting when growth commences.

MAYDAYTREE

See Cherry

MOUNTAINASH

Leaf blight, scab,fungus leaf spots

Benomyl, 50% WP

Mancozeb, 80% WP

Zineb, 75% WP

Rust

Zineb, 75% WP

¼-1

1 ½-2

Spray 2 to 4 times, 14 days apart, starting as the leaf buds open.

Apply 4 or 5 sprays, 10 days apart, starting as flower buds open.

Fire blight Streptomycin formulations Copper

See label

Spray when 20 to 25 percent of blossoms are open and and again at full bloom.

MOUNTAINLAUREL, LAUREL (Kalmia) Fungus leaf spots, leaf blight Benomyl, 50% WP

Copper Ferbam, 76% WP

See label

Spray 3 times starting at budbreak. Repeat 10 and 20 days later.

MULBERRY Bacterial blight Bordeaux mixture

5-5-100

Apply at budbreak and repeat at 7-day intervals during moist periods.

NEW JERSEY TEA (Ceanothus) Powdery mildew

Benomyl, 50% WP

½-1

Make several sprays 7 to 10 days apart. Start when disease appears.

OAK Anthracnose, fungus leaf spots and and blights, spot anthracnose, leaf blotch, leaf blister

Copper

Zineb, 75% WP

Captan, 50% WP

Benomyl, 50% WP

Dodine, 65% WP

Mancozeb, 80% WP

See label

1 ¼-2

2-4

1 ½-2

Spray 3 times: just before buds open, when leaves are half grown, and 10 to 14 days later.

Oak Wilt

2,4,5-T³

4 lbs. a.i./ gal. oil

Apply to deep girdle and axe cuts in roots to runoff before 50% wilt of tree develops. Treatment kills infected trees and prevents spread to healthy oaks.

Metham (Vapam Soil Fumigant)

See label

Soil treatment when disease first appears to prevent transmission to healthy oaks by root grafts. Follow label directions.

PEACH

See Cherry

PEAR Fire blight

Streptomycin formulations

See label

Spray when 20 to 25% of blossoms are open and repeat at 5- to 7-day intervals during bloom. Then apply weekly for 5 or 6 weeks. Best control when spraying at night.

Scab Several fungicides

See Scab under Crabapple.

Leaf spot

Benomyl, 50% WP

Ferbam, 76% WP

Mancozeb, 80% WP

Dodine, 65% WP

Zineb, 75% WP

½-1

1½-2

½-1

1 ½-2

Spray 2 or 3 times, 10 days apart, starting at budbreak.

PECAN Scab, fungus leaf spots, leaf blotch and scorch, spot anthracnose, anthracnose

Benomyl, 50% WP

Zineb, 75% WP

Maneb, 80% WP

Mancozeb, 80% WP

Dodine, 65% WP

Copper Polyram, 80% WP

Du-Ter, 47.5% WP

Powdery mildew

Benomyl, 50% WP

Du-Ter, 47.5% WP

½-1

1 ½-2

1 ¼-2

½-1

See label

½-1

¼-¼

Apply 4 to 6 sprays, 10 to 14 days apart. Start when buds begin to open. Thorough coverage is required. Follow manufacturer’s directions.

Spray when mildew is first seen. Repeat at 10- to 14-day intervals.

PHOTINIA

Powdery mildew

Benomyl, 50% Wp

Sulfur, 95% WP

½-1

2-3

Spray several times at 10- to 14-day intervals. Start when new leaf growth or disease first appears.

PINE Dothlstroma needle blight

Copper

See label

Spray twice: when new needles are just emerging and again when new needles are fully expanded.

Sclrrhia brown spot needle blight

Copper Mancozeb, 80% WP

Maneb, 80% WP

Chlorothalonil Daconil 2787 Bravo 6F

See label

1 ½-2

1 ¼-2

1 ½-2

3 qts.

Spray once or twice, 30 days apart, starting when new needles are half-grown. If rainy, spray at 2-week intervals.

Lophodermlum needle cast or blight Mancozeb, 80% WP

Maneb, 80% WP

Chlorothalonil Daconil 2787 Bravo 6F

Copper

1 ½-2

2½ 2½ pts.

See label

Spray 4 times, 2 to 3 weeks apart, starting about midsummer when the new needdies are full-grown.

Dlplodia tip blight Copper

Benomyl, 50% WP

See label

Spray twice, 10 to 14 days apart. Start as buds open.

Fusiform rust (nurseries in southern states) Ferbam, 76% WP

Spray seedlings at 5-day intervals after emergence; continue to about July 1.

Scleroderrls canker Chlorothalonil

Bravo 6F

1 ½ qts.

Spray as new growth appears in spring. Repeat at 2- to 3-week intervals until early July; then monthly until early September.

Sirococcus tip blight and Phoma spp. (West Coast only) Chlorothalonil

Bravo 6F

1 qt.

Start spraying in early November and repeat at 2- to 4-week intervals during the autumn and winter rainy period.

Annosus root and butt rot

Borax, 97% (dry, powdered)

1 Ib./50sq. ft. of stump surface

Cover fresh cut stump surface immediately after falling tree. Sprinkle liberally and evenly.

Cyllndro-cladium blight

Benomyl, 50% WP

Ferbam, 76% WP

Damping-off

Ethazol, 30-35%

PCNB

See label

Apply as a soil drench to seedling beds at 2- to 4-week intervals.

Drench around plants in nursery beds at 2- to 4-week intervals. Drench nursery beds of southern pines prior to seeding. Follow with 0.5 inch of water.

PLANETREE

See Sycamore

PLUM

See Cherry

POPLAR

Leaf rusts

Zineb, 75% WP

Spray about a week before rust is expected and again 10 to 14 days later.

Yellow leaf blister

Zineb, 75% WP

Mancozeb, 80% WP

Maneb, 80% WP

Apply several weekly sprays when spots first appear on the lower leaves.

Powdery mildew

Sulfur, 95% WP

4¼-5½

Apply at first sign of disease. Repeat 2 or 3 times at 5- to 10-day intervals.

PRIVET Anthracnose, leaf spot, twig blight

Ferbam, 76% WP

Benomyl, 50% WP

Spray several times at 10-day intervals, starting in midspring.

PYRACANTHA (Firethorn) Fire blight Streptomycin formulations

Copper

See label

Spray when 20 to 25% of blossoms are open and repeat at 5- to 7-day intervals during bloom.

Scab

Benomyl, 50% WP

Folpet, 50% WP

Dodine, 65% WP

½-1

Spray 4 times: just before blossoms open, petal-fall, 2 weeks and 4 weeks later.

QUINCE Fire blight Bordeaux mixture

2-6-100

Spray when 20 to 25% of the blossoms are open; repeat when 75% of blooms are open. Do not use streptomycin on quince.

Rust, scab, fungus leaf spots

Maneb, 80% WP

Mancozeb, 80% WP

Ferbam, 76% WP

Zineb, 75% WP

1 ½-2

Apply several times at 10-day intervals starting at budbreak.

REDBUD Cercospora and other fungus leaf spots

Captan, 50% WP

Maneb, 80% WP

Zineb, 75% WP

1 ½-2

Apply at budbreak and repeat several times at 10-day intervals during the spring rainy period.

REDCEDAR

See Juniper

RED HAW

See Hawthorn RHODODEN

DRON, AZALEA Ovullnla petal or flower blight of azalea

Benomyl, 50% WP

Zineb, 75% WP

Mancozeb, 80% WP

Thiram, 65-75% WP

Spray as flowers open. Then apply benomyl at 5-day intervals, zineb, mancozeb, and thiram 3 times weekly during the bloom period.

Powdery mildew

Benomyl, 50% WP

Sulfur, 95% WP

Karathane, 22.5% WP

½-1

3-6

½-1

Spray several times at 7- to 10-day intervals. Start when disease first appears.

Fungus leaf spots, rusts

Zineb, 75% WP

Maneb, 80% WP

Mancozeb, 80% WP

Benomyl, 50% WP

Ferbam, 76% WP

1 ½-2

½-1

Spray several times at 7- to 10-day intervals. Start when new growth appears or right after bloom. Zineb, maneb, mancozeb, and ferbam are effective against rusts.

Leaf, flower and stem gall

Zineb, 75% WP

Ferbam, 76% WP

½-1

1½

Spray just before budbreak and continue as for Fungus leaf spots.

Bud and twig blight, dieback Copper

See label

Make 3 sprays, 7 to 10 days apart, starting at budbreak.

Root and crown rot or wilt (Phytophthora cinnamomi and other fungi) Ethazol,

30-35% Diazoben

See label

Apply as drench around plants to saturate the soil. Repeat at at 4- to 12-week intervals during spring and autumn.

Cutting rot

Benomyl, 50% WP

Ethazol, 30-35%

See label

Mix 1 part benomyl with 39 parts of root-inducing hormone powder by weight. Treat cutting ends with mixture before "sticking” in rooting medium. Then drench soil as for Root and crown rot or wilt (above). Apply as for Root and crown rot or wilt (above).

ROSE

Botrytis blight

Benomyl, 50% WP

Botran, 5075% WP

Zineb, 75% WP

See label

Apply to flowers at 7- to 10-day intervals during moist weather.

Black spot, cane blights or cankers, spot anthracnose, anthracnose, fungus leaf spots Chlorothalonil, 75% WP

Folpet, 50% WP

Maneb, 80% WP

Mancozeb, 80% WP

Polyram, 80% WP

Benomyl, 50% WP

Zineb, 75% WP

1 ½-2

⁵ 1 ½-2

1 ½-2

1 ¼-2

1 ½-2

Spray at 7- to 10-day intervals, starting when new growth appears. Shorten spray interval to 5 or 7 days during rainy weater maneb, mancozeb, Polyram, zineb and chlorothalonil also control rusts.

Powdery mildew

Benomyl, 50% WP

Folpet, 50% WP

Karathane, 22.5% WP

Sulfur, 95% WP

Acti-dione

Parinol Piperalin

½-1 1 ½-2

¼-1

2-3

See label

Spray at 7- to 10-day intervals, starting when new growth appears. Thorough coverage Thorough coverage is required

SERVICEBERRY

SHADBUSH

See Amelanchier

SPRUCE

See Pine

SUMAC

Fungus leaf spots

Maneb, 80% WP

Sulfur, 95% WP

1 ½-2

4-6

Apply when disease is first seen. Repeat as needed at 7-to 10-day intervals during wet periods.

SYCAMORE, PLANETREE, BUTTONWOOD Anthracnose⁴, fungus leaf spots, leaf blight

Benomyl, 50% WP

Copper Mancozeb, 80% WP

Maneb, 80% WP

Dodine, 65% WP

Captafol Zineb, 75% WP

See label

1 ½-2

2 pts.

1 ½-2

Spray 3 times, 10 days apart, starting just before budbreak. Thorough coverage is required

Powdery mildew

Benomyl, 50% WP

Sulfur, 95% WP

TAXUS

See Yew

½-1

2-3

Spray 2 or 3 times, 7 to 10 days apart, starting when disease first appears.

VIBURNUM Powdery mildew

Benomyl, 50% WP

Sulfur, 95% WP

Karathane, 22.5% WP

½-1

1½

Spray 2 or more times, 7 to 10 days apart. Start when disease first appears. Some viburnums are sensitive to sulfur.

WALNUT, BUTTERNUT Anthracnose, yellow leaf blotch, fungus leaf spots or blights Benomyl, 50% WP

Dodine, 65% WP

Zineb, 75% WP

Mancozeb, 80% WP

Maneb, 80% WP

¼-1 ½-1

1 ½-2

Spray 3 or 4 times at 2-week intervals, starting when the leaves begin to unfold. Thorough coverage is required.

Bacterial blight (of Persian or English walnut) Copper Streptomycin formulations

See label

Spray 3 times: when flowering starts, at full bloom, and at petal-fall.

WILLOW Tar spot, leaf blight or scab, black canker, spot anthracnose

Copper

Zineb, 75% WP

Man cozeb, 80% WP

Maneb, 80% WP

Dodine, 65% WP

See label

1 ½-2

½-1

Spray 3 times, 10 days apart, starting as the buds open. Zineb, maneb and mancozeb also control rust.

Powdery mildew and rusl

Sulfur, 95% WP

4½-5½

Apply 2 or more times, 7 to 10 days apart. Start when disease first appears.

WITCH HAZEL Powdery mildew

Benomyl, 50% WP

YEW (Taxus) Phytophthora root rot (Pacific

Northwest) Ethazol, 30-35% Diazoben

Twig blight

Bordeaux mixture

½-1

See label

4-4-100

Spray 2 or more times, 7 to 10 days apart. Start when disease appears.

Drench soil around plants at 2- to 4-week intervals during April-May and again in September-October.

Apply when new growth emerges. Repeat twice more at 7- to 10-day intervals.

ALL TREES AND SHRUBS Seed decay, damping-off, seedling blights

Thiram, 5075% WP

Captan, 5075% WP

Mylone, DMTT

Diazoben

See label

Apply 2 oz./lb. of seed. If damping-off occurs, drench seedbed (4 T./gal.) when first seen. Follow label directions.

Apply as a soil drench 2 to 3 weeks prior to planting in nursery beds.

Apply as a soil drench after plants are set; repeat at 2- to 4-week intervals.

Wood rots or decays

Thiram, 75% WP

Copper naphthenate Benomyl, 50% WP

Sodium o-phenylphenate

¹ 1%

3.3-10.0%

½t./gal.

> 2%

Apply thinly in an asphalt or other non-fortified tree wound preparation.

↵1 The rates given are based on hydraulic application. If using a mistblower, follow label directions.
↵2 Copper fungicides include bordeaux mixture (usually 4-4-100 or 8-8-100) and fixed or neutral copper compounds.
↵2A Augnasan BLP has not been adequately tested in most states by specialists in the area of tree pathology, and hence cannot be fully recommended at this time.
↵3 Do not use 2,4,5-T around the home, recreational areas, pond or ditch banks, or similar sites.
↵4 Recommended for the leaf-blight stage of anthracnose only.