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Field Evaluation of Early Season Fungicide Substitutions on Tetranychid Mites and the Predators Neoseiulus fallacis and Agistemus fleschneri in Two Missouri Apple Orchards

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Abstract:

Statistically significant differences among treatment means for tetranychid mites and the predators Neoseiulus fallacis (Garman) and Agistemus fleschneri Summers were shown by substituting a single fungicide in early season while maintaining an otherwise complete pesticide spray schedule on apple trees. The fungicides benomyl, sulfur, and dodine were used until July 9 and 17, respectively, in 2 orchards followed by uniform applications of captan in all treatment blocks. Benomyl and sulfur were toxic to both N. fallacis and A. fleschneri. Dodine was innocuous to N. fallacis. Minimizing early season mortality of either N. fallacis or A. fleschneri is necessary for effective tetranychid suppression. This appears to be even more critical under Missouri growing conditions due to higher temperatures during May and June as compared with more northern states.

Document Type: Research Article

Publication date: October 15, 1975

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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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