Abstract
Toxicity tests with derris root powder and its exhausted residues, after extraction with acetone and with acetone followed by water, were carried out against chewing and sucking insects. Silk moth larvae, cabbage worms and apple aphis were used. The materials were applied in form of coarsely and finely ground dusts. The results suggest the following conclusions. Derris root dust is very toxic to sucking and chewing insects. Against aphis, the toxicity was greater when the dust was applied on wet foliage than on dry foliage. Residues from derris root completely extracted with acetone possess practically no toxicity to aphis, but are both toxic and repellent to caterpillars. Residue from derris root extracted first with acetone and then with water does not seem to possess direct toxicity to caterpillars but acts as a deterrent, preventing them from feeding on the dusted foliage. (Paper withdrawn for publication elsewhere.)
Published Version
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