Northern corn rootworm, Diabrotica longicornis, and western corn rootworm, Diabrotica virgifera virgifera, are of increasing economic concern in New York. Northern corn rootworm has been in New York for many years, causing damage to field corn in isolated locations. Western corn rootworm was first collected in western New York during 1979 and since then has spread across the state, increasing in population. The potential for economic losses in field corn from rootworms has increased significantly since the introduction of western corn rootworm into New York.