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Research ArticleArticles

Alternatives for Powdery Mildew Control on Lilac

David L. Clement, Stanton A. Gill and William Potts
Arboriculture & Urban Forestry (AUF) July 1994, 20 (4) 227-230; DOI: https://doi.org/10.48044/jauf.1994.041
David L. Clement
Regional Specialists, Cooperative Extension Service, University of Maryland, 11975 Homewood Road, Ellicott City MD 21042
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Stanton A. Gill
Regional Specialists, Cooperative Extension Service, University of Maryland, 11975 Homewood Road, Ellicott City MD 21042
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William Potts
Regional Specialists, Cooperative Extension Service, University of Maryland, 11975 Homewood Road, Ellicott City MD 21042
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Article Figures & Data

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    Table 1.

    Temperature and humidity readings for 1991 and 1992 lilac powdery mildew spray trials.

    DateTemperature, °CRelative humidity, %
    1991
    12 July3234
    25 July2665
    16 Aug2951
    29 Aug2945
    9 Sept2854
    1992
    8 July3046
    3 Aug2952
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    Table 2.

    Effectiveness ratings of biorational compounds against powdery mildew on lilac.

    TreatmentWhole plant*Individual leaf*
    1991
    Bayleton 2 week interval1.0 c**1.1 c
    Bayleton 4 week interval1.0 c1.1 c
    M-Pede 2 week interval2.0 bc2.1 abcd
    M-Pede 4 week interval1.1c1.6 bcd
    SunSpray oil 2 week interval1.0 c1.0 d
    SunSpray oil 4 week interval1.0 c1.0 d
    Cloud Cover 4 week interval2.8 abc2.9 abc
    Water control 2 week interval4.0 ab3.6 a
    Water control 4 week interval4.1 a3.5 ab
    1992
    Bayleton1.0 b1.0 b
    SunSpray + sodium bicarbonate1.2 b1.0 b
    Saf-T-Side1.0 b1.0 b
    SunSpray oil2.2 ab2.6 ab
    M-Pede2.6 ab2.5 ab
    Sodium bicarbonate3.7 a3.8 a
    Water control4.0 a4.1 a
    • ↵* Disease ratings based on a 1 - 5 scale; 1=0 - 20%; 2 = 21 - 40%; 3 = 41 - 60%; 4 = 61 - 80%; 5 = 81 - 100% infection.

    • ↵** Means within columns and years with at least one letter in common are not significantly different.

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Arboriculture & Urban Forestry (AUF)
Vol. 20, Issue 4
July 1994
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Alternatives for Powdery Mildew Control on Lilac
David L. Clement, Stanton A. Gill, William Potts
Arboriculture & Urban Forestry (AUF) Jul 1994, 20 (4) 227-230; DOI: 10.48044/jauf.1994.041

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Alternatives for Powdery Mildew Control on Lilac
David L. Clement, Stanton A. Gill, William Potts
Arboriculture & Urban Forestry (AUF) Jul 1994, 20 (4) 227-230; DOI: 10.48044/jauf.1994.041
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