Toxicity of Neem-Derived Insecticides to Various Life Stages of the Elm Leaf Beetle
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Rick J. Zimmerman, D. Casey Sclar, Terri Randolph, and Whitney S. Cranshaw
Abstract: A series of laboratory and field experiments to determine the suitability of neem oil derived insecticides for elm leaf beetle control was performed. Laboratory experiments determined mortality and antifeedant effects to elm leaf beetle larvae. Ovicidal activity was also evaluated in the laboratory. Field trials were conducted on mature elm trees to evaluate the efficacy of neem on elm leaf beetle larvae. Results of laboratory studies indicated significant mortality to elm leaf beetle larvae as a result of neem applications. In addition, greater mortality was observed to eggs treated with neem. Also, anti-feedant effects of neem-treated leaves was observed in all three elm leaf beetle larval instars. Neemtreated trees showed significantly less elm leaf beetle feeding damage than control trees for approximately one month after application. This study demonstrates the potential of neem oil formulations for elm leaf beetle control.
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https://doi.org/10.48044/jauf.1995.029
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