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Research ArticleArticle

Efficacy of Bacillus Thuringiensis and Diflubenzuron on Douglas-Fir and Oak for Gypsy Moth Control in Oregon

Jeffrey C. Miller and Kenneth J. West
Arboriculture & Urban Forestry (AUF) October 1987, 13 (10) 240-242; DOI: https://doi.org/10.48044/jauf.1987.050
Jeffrey C. Miller
Department of Entomology, Oregon State University, Corvallis, OR 97331
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Kenneth J. West
Department of Entomology, Oregon State University, Corvallis, OR 97331
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    Fig. 1.

    Occurrence of maximum, mean, and minimum daily temperatures (°C) during the study period. Corvallis, Oreg. 1986.

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    Fig. 2.

    Occurrence of measurable precipitation (mm) during the study period. Corvallis, Oreg. 1986.

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    Table 1.

    Mortality (%) of second instar gypsy moths on foliage of Oregon white oak and Douglas-fir treated with Bacillus thuringiensis Berliner (Bt) or diflubenzuron (DFB). Ground sprayed to point of drip. Corvallis, Oregon 1986.

    Treatment1Sample date post treatment (days)2
    16142128475864
    Oregon White Oak
       check0a0a12a48a20a28a8a56a
       Bt once100b100b100b100b100b100b100b100b
       Bt twice100b100b100b100b100b100b100b100b
       DFB once100b100b96b100b84b100b80b100b
    Douglas-fir
       check0a0a8a64a16a4a12a54a
    Bt once100b100b100b100b100b88b88b96b
    Bt twice100b100b100b100b100b100b100b88b
    DFB once100b100b100b100b84b76b92b92b
    • ↵1 n = 25 larvae per treatment-sample day. Applied at a concentration of: Bt 4.22 BIU/1; DFB 15ml/1.

    • ↵2 days are time of foliage collection post treatment. Different letters within a column designate significantly different results, LSDtest, p < 0.01.

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Arboriculture & Urban Forestry (AUF)
Vol. 13, Issue 10
October 1987
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Efficacy of Bacillus Thuringiensis and Diflubenzuron on Douglas-Fir and Oak for Gypsy Moth Control in Oregon
Jeffrey C. Miller, Kenneth J. West
Arboriculture & Urban Forestry (AUF) Oct 1987, 13 (10) 240-242; DOI: 10.48044/jauf.1987.050

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Efficacy of Bacillus Thuringiensis and Diflubenzuron on Douglas-Fir and Oak for Gypsy Moth Control in Oregon
Jeffrey C. Miller, Kenneth J. West
Arboriculture & Urban Forestry (AUF) Oct 1987, 13 (10) 240-242; DOI: 10.48044/jauf.1987.050
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