Abstract

A significant negative correlation coefficient and linear regression (Y = 80.9−201.0X) was found between concentration of gossypol and the toxicity of methyl parathion applied topically to larvae of the tobacco budworm, Heliothis virescens (F.), when they had been reared on diet containing 5 concentrations of gossypol. All sizes of larvae tested were affected similarly. Significant regressions were not obtained in similar tests with endrin or FMC-33297 (3-phenoxybenzyl cis - trans -(±)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate).

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