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Some areas of the eastern Midwest have observed a steady and substantial increase of damage in first-year corn due to a behavioral variant of the western corn rootworm (WCR) (Diabrotica virgifera virgifera) that has evolved to lay eggs in soybeans and to a lesser extent in other crops. This “rotation-resistant�? WCR variant also lays eggs in wheat stubble, alfalfa. and oats. When WCR eggs laid in non-corn fields hatch the following season, the larvae can cause corn root damage.10;10;
Male and female adult WCR are yellow to green in color with a black stripe along the sides of their wing covers. They are about 5/16-inch long (Figure 1). Female wing covers usually have a regular striped pattern, while male wing covers 10;10;may be nearly completely black. Northern corn rootworm adults are tan to pale green (Figure 2), and southern corn rootworm adults are yellow to green in color (Figure 3), with 11 black spots on 10;10;their back.10;10;
Farmers in or near areas where the WCR variant has been identified should scout soybean fields for adult WCR in August and early September to identify the potential for crop-damaging levels of WCR larvae where corn will be planted next spring. Scouting this summer allows time for planning a WCR management strategy for next spring. Soybean fields should be scouted in the morning or late afternoon, when WCR adults are most active, using either sweep nets or sticky traps. 10;10;
In fields that were planted with products that contain Genuity® VT Triple PRO® technology that experienced greater-than-expected CRW damage during this season: