Impact of Selective Use of the Synthetic Pyrethroid Fenvalerate on Apple Pests and Natural Enemies in Large-orchard Trials

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The synthetic pyrethroid, fenvalerate, when used throughout the season (112 g [AIl/ha) in a commercial apple orchard, provided excellent pest control compared to a standard insecticide schedule, but caused outbreaks of the European red mite, Panonychus ulmi (Koch). Populations of the mite predator, Stethorus punctum (LeConte), never became established in the fenvalerate block, but were numerous and effectively controlled mites in the standard block. Insecticide and acaricide costs were higher for the fenvalerate program, but the reduction in damage due to the tufted apple budmoth, Platynota idaeusalis (Walker), over the standard program resulted in a substantial net gain of ca. $395/ha under heavy pest pressure. Late-season sprays of fenvalerate at reduced dosages (56 and 28 g [AIl/ha) also caused a resurgence of mites, higher mite populations occurring in the block sprayed with the higher dosage. Established predator populations were decimated subsequent to the fenvalerate sprays at either dosage. The total costs of the pesticide programs were about equal, but the slightly better control with the fenvalerate program resulted in a net gain of ca. $32/ha. Short- and long-term ramifications of fenvalerate use in an integrated pest management framework are discussed.

Document Type: Research Article

Publication date: February 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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