The Influence of Certain Biological and Environmental Factors on Insecticide Tolerance of the Lygus Bug, Lygus hesperus1
Authors: BACON, OSCAR G.; RILEY, W. D.; ZWEIG, GUNTER
Source: Journal of Economic Entomology, Volume 57, Number 2, April 1964 , pp. 225-230(6)
Publisher: Entomological Society of America
Abstract:Many factors appear to influence DDT tolerance of the lygus bug, Lygus hesperus Knight. Lygus bugs collected from alfalfa seed fields during the period of bloom and seed set are more tolerant of DDT than those collected from alfalfa hay fields. Lygus bugs reared in the laboratory on green string beans are more tolerant of DDT than those from either alfalfa hay or seed fields Adult females are more tolerant than males. Tolerance to DDT increases progressively with each nymphal in star from third in star to adult.
DDT is shown to have a negative temperature coefficient of action, while toxaphene has a positive temperature coefficient of action.
Increase in DDT tolerance closely parallel increases in total body lipids. Differences in tolerances of two sexes could not be explained on the basis of differences in total body lipids.
Analyses of body lipids of L. hesperus have shown that at least 7 fatty acids are present. They are myristic, palmitic, palmitoleic, stearic, oleic, linoleic, and linolenic. No significant qualitative or quantitative differences in fat composition of the two sexes were apparent. Slight difference in amounts of the fatty acids were found in insects taken from different hosts at various times of the year, but it is believed that these differences would not account for the observed differences in susceptibility to DDT.
Document Type: Research Article
Publication date: April 1, 1964
- 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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