Influences of Rainfall and Sprinkler Irrigation on the Residual Activity of Insecticides Applied to Corn for Control of Adult Western Corn Rootworm (Coleoptera: Chrysomelidae)

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Abstract
A western corn root worm, Diabrotica virgifera virgifera LeConte, adult bioassay technique using insecticide-treated corn leaves was used to determine the influence of moisture on the residual activity of several insecticides. Results of the studies indicated that moisture (rainfall or sprinkler irrigation) was a major factor influencing the decline in residual activity of carbaryl, carbaryl-oil, phosmet, and Penncap-M. Residual activity of dlazmon and malathIOnwas neghgible at 7 days, regardless of the amount of moisture. In tests comparing dry land and sprinkler-irrigated treatments, there was a significant negative correlation (r = −0.91) between percent control and the amount of water applied. Both linear and quadratic effects were highly significant (P <0.005). There were no significant linear or quadratic effects detected between percent control and days post application. Carbaryl-oil, diluted with ¼ part diesel fuel, and carbaryl-XLR provided slightly shorter residual activity than undiluted carbaryl-oil treatments. However, all three treatments provided considerably longer residual activity than other insecticides tested.

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