Abstract
Abstract Various pesticides were applied to whorl stage (stage 2) field corn on 26 Jun. Treatments were applied over the whorl of the plant with insecticide boxes mounted on a tool bar. Each treatment was applied to 3 × 10 m plots and was replicated 4 times in a split plot design. Insecticide treatments were designated as whole plot treatments, infestation method (artificial and natural) was designated as the split plot treatments. A total of =40 first instar ECB larvae were applied to 4 randomly selected plants within each plot. These larvae were applied on corn cob grit to the whorl of the plant 1 day prior to pesticide application. To evaluate control of ECB larvae, 4 artificially ECB infested and 4 randomly selected corn plants were collected from each plot 4 wk post application. Each stalk was split from root to tassel and the number of ECB larval cavities were counted. In addition to this evaluation method, 25 consecutive plants within 1 row of each plot were evaluated for the presence of ECB feeding damage. Finally, 4 randomly selected plants were marked and evaluated at 10, 17, 24, 32 and 46 DAT for the presence of spider mites and arthropod predators.
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