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Effect of Tree Size and Severity of Infestation on Efficacy of Imidacloprid against Emerald Ash Borer (Coleoptera: Buprestidae)

Multiyear studies describing the effects of tree size and initial infestation on efficacy of imidacloprid (Merit 75 WSP) soil drenches against emerald ash borer, Agrilus planipennis (Fairmaire), were initiated in spring 2004 at two locations in Michigan. Eighty-five green ash trees (Fraxinus pennsyl...