Abstract
A 4-yr study comparing planting vs. cultivation time applications of soil insecticides for control of larvae of western, Diabrotica virgifera LeConte, and northern, D. longicornis (Say), corn rootworms showed no significant difference between the 2 application methods. There was a significant year X application method (cultivation vs. planting) interaction but not an insecticide X application method interaction. Although the insecticide X application method interaction was not statistically significant, bufencarb 10G and diazinon 14G applications at planting time consistently failed to provide the same degree of root protection as compared to cultivation applications.

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