Abstract
Twenty-one insecticides were tested on adults and 7 of the 21 were tested on 3rd and 4th instars of Chrysomela scripla F. In tests with adults, the decreasing order of toxicity at LD90 was: chlorpyrifos, resmethrin, phoxim, diazinon, mexacarbate, aminocarb, dimethoate, fenitrothion, Dowco 217 (dimethyl 3,5,6-trichloro-2-pyridyl phosphate), trichlorfon, Landrin® (3,4,5-trimethyl-phenyl methylcarbamate 93%; 2,3,5-trimethyl-phenyl methylcarbamate 7%)-carbaryl, lauroyl-trichlorfon (N-dodecanoyltrichlorfon), propoxur, methomyl, pyrethrins, carbofuran, tetrachlorvinphos, naled, malathion, and DDT. Chlorpyrifos and resmethrin were both over 240 times more toxic than DDT. Phoxim and diazinon were over 130 times more toxic than DDT; the other candidate insecticides ranged from 2–61 times more toxic than DDT. In tests with larvae, the decreasing order of toxicity at LD90 was: mexacarbate, resmethrin, chlorpyrifos, phoxim, propoxur, diazinon, and DDT. Toxicity to adults and larvae was generally similar. However, mexacarbate was significantly more toxic to the larvae than to the adults at both LD50 and LD90.
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