Timing of Pesticide Treatments on Safflower to Prevent Lygus from Dispersing to Cotton

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Lygus Hesperus Knight and L. elisus Van Duzee disperse from maturing safflower fields and immigrate to young cotton fields each year on the west side of the San Joaquin Valley, California. Lygus population growth and adult dispersal was studied from 1967 to 1969. Buildup of large Lygus numbers is directly influenced by spring temperatures. When climatic conditions are favorable, the time of mass movements out of the safflower is usually the result of large numbers of nymphs becoming adults. When climatic conditions do not favor nymphal development, dispersal from safflower occurs later and is more closely associated with crop maturity.

Areawide safflower treatments based on nymphal populations were employed in 1970–72 with excellent results. Safflower fields were treated when the majority of nymphs was in the 3rd–5th stages. The need for early-season treatment of lygus bugs in cotton was reduced. This permitted survival of natural enemies of other cotton pests.

Document Type: Research Article

Publication date: February 1, 1974

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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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