Modeling Lygus hesperus Injury to Cotton Yields

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A model of the impact of a lygus, Lygus hesperus (Knight), population on cotton square development and subsequent impact on boll development is proposed. The model is specified as a multistage production process and parameters are estimated using data collected in Kern County, Calif. in 1974. Lygus cause significant injury to cotton during two disjoint periods. The first period occurs during the early squaring stage of the plant when squares are forming at a rate of ca. 100% a week. The second period occurs when the cumulative number of squares per unit area has peaked. The ultimate impact of lygus on cotton yields depends heavily on plants bearing fruit in the early period. Results of computations indicate that lygus can significantly injure the cotton yield in fields with subaverage square loads during the early period. The model can be used to determine economically optimal spraying strategies.

Document Type: Research Article

Publication date: October 1, 1985

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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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