Four insecticides, carbofuran, chlorpyrifos, methidathion, and dimethoate, were tested against grasshoppers in laboratory and field experiments. Carbofuran was the most effective compound in all tests but it was concluded that, over-all, it would be difficult to predict field performance on the basis of laboratory data alone.
Survey of grain crops in Saskatchewan showed that most of the serious damage by wireworms occurred in the western two-thirds of the province. The average damage for ail soil and cropping conditions was greatest in wheat, less in barley, and least in oats. Serious damage occurred occasionally in barley and oats. With wheat and barley, damage was generally greater on summer-fallow than on stubble, and greater in medium-textured soils than in heavy soils. With oats there were some deviations from this pattern. Damage in wheat on summerfallow declined gradually from 1954 to 1961, but the proportion of fields showing some wireworm damage remained fairly constant. Thus, in spite of the widespread use of chemical seed treatments, the potential wireworm hazard has not diminished.
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