The ‘eastern variant’ of the western corn rootworm (WCR), Diabrotica virgifera virgifera, has developed a behavioral adaptation to the corn-soybean rotation in some areas of the Midwest. The variant western corn rootworm (VWCR), first documented in east-central Illinois, is known to circumvent the cornsoybean crop rotation by laying eggs in soybean. Like normal corn rootworm beetle populations, the VWCR moves readily between corn and other crops between late July and early September. Unlike normal corn rootworm beetle populations however, the VWCR can lay heavy populations of eggs in soybean fields, resulting in economic injury to corn planted in the same field the following year.