Differences in Percentages of Fatty Acids in Triglycerides and Phospholipids of Larvae of the Bollworm and the Tobacco Budworm as Possible Factors in Their Tolerance to Insecticides

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Fatty acids in the triglycerides and phospholipids from early (about 3rd-stage) and late (about 5th-stage) larvae of Heliothis zea(Boddie), and H. virescens(F.) susceptible to insecticides were analyzed by gas chromatography and compared.

The triglycerides of early larvae of H. zeacontained a higher percentage of stearic acid than the triglycerides of H. virescensof the same age. Also, the triglycerides of both early and late larvae of H. zeahad more oleic and less linoleic acid than the triglycerides of H. virescensof the same ages. The phospholipids of both instars of H. zeacontained higher percentages of stearic acid and lower percentages of linoleic and linolenic acids than the phospholipids of H. virescensof the same ages. Since the differences in fatty acids could not be explained entirely by larval growth, they may have a role in the greater natural tolerance of H. virescensto insecticides because they could affect the solubility of insecticides in lipids or the characteristics of the cell membrane.

Document Type: Research Article

Publication date: October 15, 1971

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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