Comparative Toxicity Tests as an Aid in Selecting Insecticides for Control of the Cherry Fruit Fly1

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Abstract
Contact action of 18 insecticides was compared, using a Hoskins-Caldwell spray chamber and Rhagoletis cingulata, as a test insect. The data were subjected to probit analyses. Using Sun''s toxicity index (parathion = 100), the following phosphate insecticides had LD95 indices higher than parathion: DDVP (702), diazinon (161), Pirazinon (137), Phosdrin (132), and demeton (132). Tetraethyl pyrophosphate (TEPP) (98) and Amer. Cynamid 4124 (83) were close to parathion. EPN (49), Dipterex (28), and malathion (12) were inferior. Among the non-phosphate insecticides, aldrin (88) and heptachlor (108) were close to parathion at the LD95 index. Perthane (36), chlordane (20), dilan (18), Strobane (7), and methoxychlor (6) were inferior. Perthane was the most effective of this group, being between one-fifth to one-fourth as toxic as parathion. Diazinon and Perthane were the most promising for orchard control programs. Diazinon has proved to be slightly superior to parathion in orchard tests at a dosage equal to parathion, while Perthane has given good control of the cherry fruit fly at 2 to 4 times the dosage of parathion required.

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