The Response of Spodoptera littoralis Larvae to Gossypol Incorporated in an Artificial Diet 12

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Abstract
The effect of gossypol acetate on the growth, pupation rate and mortality of larvae of Spodoptera littoralis (Boisd.) was investigated by incorporating the compound in a semi-synthetic diet. 0.5% and 0.25% gossypol acetate-treated diets as well as an untreated diet were offered to the larvae throughout their entire life span. On the 0.5% gossypol acetate diet, within the 1st 10 days larval mortality was nearly 70%, the average weight was very low at each observation time, and only 0.3% of the larvae pupated. On the 0.25% gossypol acetate diet 44% of the larvae died within the 1st 10 days, the average weights were intermediate between 0.5% and the control, and 26% of the larvae pupated.

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