The western corn rootworm (WCR, Diabrotica virgifera virgifera) is one of the most serious pests in maize. In some parts of Europe, maize is frequently cultivated adjacent to the Styrian oil pumpkin ( Cucurbita pepo pepo var. styriaca ). Adult beetles are strongly attracted to the flowers of this cucurbit, likely due to their strong scent, and lay some of their eggs in the soil of the pumpkin crop. This makes crop rotation, an...