Abstract
Control of nothern corn rootworm, Diabrotica longicornis (Say), resulting from soil applications of carbofuran in southwestern Ontario varied considerably (Smith 1980). However, Ball and Su (1979) showed in laboratory studies that topical applications with sublethal doses of carbofuran increased the longevity and fecundity of western corn rootworm, D. virgifera LeConte, females. This is a report of effects of soil applications of carbofuran on northern rootworm egg populations in corn grown without rotation. The work was done in conjunction, with studies to determine the economic importance of larval populations on clay soil at two locations in southwestern Ontario. Details of methods of applying carbofuran and sampling rootworm eggs were described (Smith 1980).
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