The Effect of Formulation on Residual Activity of Dimethoate to the House Fly

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Tests carried out both by topical application and by dry-film technique on diazinon-, malathion-, and parathion-laboratory selected house flies, Musca domestica L., showed that the selective pressure induced only a very low level of cross resistance to dimethoate as suggested by a maximum resistance ratio of 1.6-fold at LD93.

Comparative laboratory studies carried out by exposing the flies for 30 minutes to several surfaces such as white-washed and unwhitewashed plaster, wood, bricks, and glass indicated that the residual activity was far higher for the insecticide formulated as a wettable powder having a particular composition and specific properties than as an emulsion concentrate.

Even more striking differences between the wettable powder and the emulsion concentrate were obtained from laboratory tests in which flies were exposed for 18 hours to treated plaster panels but had a choice of resting on untreated surfaces, and from other tests conducted in natural conditions by exposing the flies for 30 (and 15) minutes to the ceilings, walls, and plaster panels in sprayed barns. In both cases the wettable powder (0.2 g active ingredient/m2) provided a residual effect lasting for several months whereas the emulsion concentrate (0.7 g active ingredient/m2) exerted its residual action for only a few days.

Document Type: Research Article

Publication date: February 1, 1966

More about this publication?
  • 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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