Rate Response of Cotton to Three Pyrethroids

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Physiological response of cotton, Gossypium hirsutum L., to increasing rates of three pyrethroids was investigated. Fenvalerate, flucythrinate, and cypermethrin were applied to cotton at six rates each in season-long applications. Due to a dry 1983 season, plant growth was restricted and yields were low. Square numbers and yield did not respond to rate. Boll numbers increased quadratically with an increase in rate of cypermethrin, but yield was not affected. The 1984 growing conditions were favorable and yields were high. Square and boll numbers increased with an increase in rate of cypermethrin, yet decreased at the highest rates in a quadratic response curve. Yield in cypermethrin plots ,increased quadratically to rate and was correlated with square and boll responses. Boll numbers increased with the same type quadratic response to increasing rates of flucythrinate, yet yield increases were significantly linear. Yields did not respond to increasing rates of fenvalerate.

Document Type: Research Article

Publication date: December 1, 1986

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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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