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Research ArticleContributed Abstract

Phytotoxicity of Post-Emergence Grass Herbicides to Ornamental Trees, Shrubs, Vines, and Groundcovers

Robert P. Rice
Arboriculture & Urban Forestry (AUF) January 1984, 10 (1) 7-8; DOI: https://doi.org/10.48044/joa.1984.10.1.7
Robert P. Rice Jr.
Robert P. Rice, Jr., Ornamental Horticulture Department, California Polytechnic State University, San Luis Obispo, California
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Purpose: To determine whether Fusilade, Poast, and CGA 24275, can be safely used as over-the-top treatments in ornamentals to control weedy grasses

Procedure: Plants were grown in containers and sprayed with herbicides at approximately 1 month intervals with a hand held small plot sprayer at 30 psi in a volume of 36 gallons/acre. Plants were assessed visually 1 month after each application using a scale of 0-10 where 1 equals no injury and 10 equals death.

Experimental Design: Completely randomized with 3 replications

Applications: 11 May 1983 — sunny, 70 F, soil dry, wind less than 5 mph 18 June 1983 — foggy, 65 F, soil dry, wind 5 mph

Treatments:

  1. Control (Con)

  2. Fusilade .5 #ai/A + .25% X77 (Fus. 5)

  3. Fusilade 2.0 #ai/A + .25% X77 (Fus. 2)

  4. Poast 1.0 #ai/A + oil* (Po 1)

  5. Poast 2.0 #ai/A + oil* (Po 2)

  6. CGA 24275 1 #ai/A + oil* (CGA 1)

  7. CGA 24275 2 #ai/A + oil* (CGA 2)

June 13, 1983July 15, 1983
SpeciesConFusPoCGAConFusPoCGA
0.52.012120.52.01212
Ajuga reptans1.71.00.00.30.30.30.30.70.30.30.70.30.00.7
Arbutus unedo1.00.70.30.00.31.00.71.30.70.30.71.01.00.7
Arenaria verna2.35.02.02.30.02.00.01.00.00.00.00.00.00.0
Asparagus densiflorus ‘sprengeri’0.00.30.70.70.70.71.00.00.00.00.00.00.00.0
Campanula carpatica0.01.00.00.00.00.00.00.30.00.3—0.00.00.0
Cerastium tomentosum5.33.75.06.06.35.75.06.35.75.77.06.76.76.3
Eucalyptus citriodora0.70.00.00.30.70.70.30.00.00.71.01.02.00.0
Eucalyptus nicholii———————0.32.3—1.02.71.00.0
Euryops pectinatus0.3—0.00.00.70.70.00.00.00.30.02.70.00.0
Gazania ringens ‘Ieucoleana’0.00.00.00.00.00.00.00.31.00.30.30.50.30.0
Geijera parviflora0.00.00.00.00.00.00.00.00.00.00.30.01.30.0
Hedera helix0.30.00.00.30.70.70.30.30.00.00.00.00.30.3
Herniaria glabra0.00.71.01.00.71.01.00.00.00.00.00.00.00.0
Juniperus chinensis ‘Hetzi’0.01.01.70.30.30.70.50.00.01.00.00.00.01.7
Juniperus horizontalis ‘Bar Harbor’0.71.33.00.30.72.05.00.75.37.71.70.05.77.7
Juniperus scopulorum ‘Witchita Blue’0.00.00.00.00.00.00.00.00.01.00.00.00.01.0
Juniperus wiltonii0.00.01.00.30.00.00.30.00.00.00.00.00.00.0
Leptospermum laevigatum0.00.00.00.00.00.00.00.70.00.00.70.00.00.0
Ligustrum japonicum1.30.71.32.30.71.01.07.51.35.38.03.74.75.0
Liquidambar styraciflua0.30.30.00.00.00.00.00.00.00.00.00.00.00.0
Lonicera japonica0.00.00.00.00.00.00.00.71.00.70.00.30.70.3
Lysimachia nummularia0.00.00.00.70.00.00.30.00.00.30.30.00.00.0
Metrosideros excelsus0.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Nandina domestica0.30.71.31.00.71.01.70.00.70.30.70.30.00.7
Nerium oleander0.00.00.00.00.00.00.00.00.00.00.00.70.01.0
Ophiopogon japonicus0.00.01.00.00.3—1.70.00.00.00.00.00.00.0
Pelargonium domesticum0.30.30.70.00.70.70.30.00.00.00.00.00.00.0
Photinia fraseri0.30.00.30.00.30.30.30.70.00.30.00.00.70.0
Polygonum capitatum3.01.01.01.01.01.01.01.02.01.51.52.02.01.5
Potentilla verna0.73.02.02.71.73.01.00.71.01.01.30.71.01.0
Salix matsudana ‘tortuosa’1.01.31.01.31.50.30.70.00.00.70.00.00.00.3
Sedum × rubrotinctum ‘Christmas cheer’0.00.00.00.00.00.00.01.00.00.00.00.00.70.5
Spirea Vanhouteii0.00.00.50.00.00.00.00.51.00.00.70.52.00.0
Syzgium paniculatum0.00.00.00.00.00.00.00.00.00.70.00.00.70.0
Vinca minor0.31.31.00.71.01.00.70.70.70.30.70.30.71.0
  • ↵*0 = no injury, 10 = death

Injury Ratings*

Footnotes

  • ↵* 1 quart/100 gallons

  • © 1984, International Society of Arboriculture. All rights reserved.
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Phytotoxicity of Post-Emergence Grass Herbicides to Ornamental Trees, Shrubs, Vines, and Groundcovers
Robert P. Rice
Arboriculture & Urban Forestry (AUF) Jan 1984, 10 (1) 7-8; DOI: 10.48044/joa.1984.10.1.7

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Phytotoxicity of Post-Emergence Grass Herbicides to Ornamental Trees, Shrubs, Vines, and Groundcovers
Robert P. Rice
Arboriculture & Urban Forestry (AUF) Jan 1984, 10 (1) 7-8; DOI: 10.48044/joa.1984.10.1.7
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