Abstract
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 LD95. Comparative laboratory studies carried out by exposing the flies for 30 minutes to several surfaces such as whitewashed 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.
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