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Demographic Analysis of Induced Resistance Against Spider Mites (Acari: Tetranychidae) in Cotton

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Demographic analyses were conducted of twospotted spider mites, Tetranychus utica Koch, raised on excised leaves of cotton, Gossypium hirsutum L., plants that had been previously damaged by mites, Tetranychus Turkestani Ugarov and Nikolski, or on leaves of undamaged controls. There were no differences in survival or development of individuals reared on leaves of the two treatments. Fecundity of mites was reduced by approximately 50% on excised leaves from plants that had been damaged as cotyledons relative to mites grown on leaves from undamaged control plants. Other workers who have examined the effects of plant conditioning on spider mites also have found this striking effect on fecundity and no effect on survivorship and development. This demographic pattern is consistent with patterns noted when the nutritional quality of the host plant is diminished but inconsistent with patterns caused by changes in the "secondary chemistry" of the host. Adult female mites behaviorally preferred excised leaves of control plants compared with excised leaves of damaged plants. Further work is required before a reliable behavioral assay is available that can be used to determine the chemical nature of induced resistance in cotton.

Document Type: Research Article

Publication date: April 1, 1989

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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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