Weekly yields and control costs were used to calculate the economic benefits of Tetranychus urlicae Koch suppression by a variety of chemical, predaceous mite (Phytoseiulus persimilis Athias-Henriot), and chemical plus predaceous mite treatments. Although three or four releases of P. persimilis at 4,050/ha in the 1988-1989 or 1990-1991 seasons, respectively, provided a net benefit per hectare of $2,170-$4,315 above the untreated controls, the economic returns from two applications of abamectin ($5,062- $15,802) or fenbutatin-oxide ($4,401-$9,146) ranged from nearly twice to approximately three times higher than the P. persimilis treatments alone. The best returns were generated by abamectin in combination with releases of P. persimilis. In both seasons, the additive net benefits of abamectin alone and P. persimilis alone were essentially equal to the net benefit from the combination (1988-1989, $6,890; 1990-1991, $19,705),thereby indicating compatibility. Both sampling and economic data indicated that neither fenbutatin-oxide nor hexythiazox were consistently compatible with the use of P. persimilis. The implications of these results for the development of integrated pest management programs for strawberries are discussed.
Document Type: Research Article
Publication date: June 1, 1993
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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.