Abstract
Tests were conducted with six organic insecticides in a settling type spray chamber to determine their relative dorsal contact toxicity to overwintering larvae of the European pine shoot moth, Rhyacionia buoliana (Schiff). No significant mortality was obtained with DDT, chlordane, or BHC at any concentration used. Malathion, Thimet® O,O -diethyl S -(ethylthio) methyl phosphorodithioate, and dimethoate produced mortality at all concentrations used. Failure of DDT to act as a contact insecticide in these tests suggests that the excellent control obtained with it in the field is due to the residue acting as a stomach poison.
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