Presenter Information

J. Tollefson, Iowa State University

Start Date

2-12-1993 12:00 AM

Description

Corn Rootwonns have one generation per year and a strong preference for corn. You are familiar with the significance of their preference for corn. Other then local populations that have demonstrated "extended diapause" (a topic for another concurrent session), rootworm larval injury has only been of concern when com is planted after com (continuous corn). The most common tactic used by growers to protect continuous corn from larval injury is to apply an insecticide to the soil at planting. The second fact, that economically important corn rootwonns have only one generation per year, has generated interest in a second way insecticides might be used to avoid larval injury; the broadcasting of a foliar insecticide spray to kill adult corn rootworms before they lay their eggs. Northern and western com rootworms lay the majority of their eggs during August and early September. The eggs overwinter in the soil, and the damaging larval stage hatches the following June. If the adults were eliminated from a field before they laid their eggs, there would be no larvae to damage corn the following season.

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Dec 2nd, 12:00 AM

Using Adult Baits to Manage Corn Rootworms and Improved Economic Thresholds for Corn Rootworm Traps

Corn Rootwonns have one generation per year and a strong preference for corn. You are familiar with the significance of their preference for corn. Other then local populations that have demonstrated "extended diapause" (a topic for another concurrent session), rootworm larval injury has only been of concern when com is planted after com (continuous corn). The most common tactic used by growers to protect continuous corn from larval injury is to apply an insecticide to the soil at planting. The second fact, that economically important corn rootwonns have only one generation per year, has generated interest in a second way insecticides might be used to avoid larval injury; the broadcasting of a foliar insecticide spray to kill adult corn rootworms before they lay their eggs. Northern and western com rootworms lay the majority of their eggs during August and early September. The eggs overwinter in the soil, and the damaging larval stage hatches the following June. If the adults were eliminated from a field before they laid their eggs, there would be no larvae to damage corn the following season.