Multiphase Laboratory Bioassays to Select Chemicals for Field-Testing on the Western Spruce Budworm124

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Abstract
A multiphase bioassay of 10 insecticide formulations was conducted with last instars of Choristoneura occidentalis Freeman. Based on assessments of intrinsic toxicity (spray and feeding), residual activity, and rainfastness, the probable decreasing order of efficacy of the formulations is: BAY SIR 8514 (N-([trifluoromethoxy) phenyl]carbamoyl)-2-chlorobenzamide), carbaryl (Sevin XLR formulation), thiodicarb, sulprofos, permethrin, carbaryl (Sevin-4-oil formulation), fenitrothion, malathion, phosmet, and phosmet with 2% rhoplex.