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Parameters of Dicofol Spray Deposit in Relation to Mortality of European Red Mite

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Dicofol WP suspensions of 2, 8, and 32 g/liter, deposited as droplets of precisely controlled diameter on discs cut from mature peach leaves, were counted, bioassayed with adult female Panonychus ulmi (Koch), and assayed chemically for dicofol. Within the desired mortality range, 80–90%, the optimum deposit was expressed in a region bounded by the following parameters: droplet diameter of 100  with a concentration of 32 g/liter, diameter of 250  with a concentration of 8 g/liter, deposits of 0.6 and 1.4 g ()/cm2, and droplet numbers of 80 and 250/cm2. With droplets under 200  and 2 or 8 g/liter dicofol, no increase in efficacy was obtained by increasing spatial density. Above 1.4 /cm2, any advantage gained by using fewer droplets was nullified by wastage of chemical.

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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