Some northern corn rootworm (Diabrotica barberi Smith and Lawrence) populations exhibit extended diapause, where eggs remain in diapause for two or more years in the soil. This trait has been formally documented to occur primarily in regions of Minnesota, Iowa, and South Dakota. There is some anecdotal evidence that the extended diapause trait extends into extreme northeast Nebraska but no empirical studies have been conducted to confirm this. In 2004, significant northern corn rootworm emergence was observed in first-year corn in east-central Nebraska counties bordering the Platte River. In Saunders County, at the University of Nebraska Agricultural Research and Development Center, relatively high densities of northern corn rootworms were collected in emergence cages from first year corn that had been in corn/soybean rotation for 6 years. This had not been observed in this rotation system previously. Therefore, a study was initiated to test the hypothesis that the northern corn rootworm extended egg diapause trait has moved into the population in east-central Nebraska. Eggs were collected from northern corn rootworms that emerged from first-year corn near Ithaca, NE, in 2004. Eggs are being maintained under appropriate controlled environmental conditions to determine percentage hatch after one or more years. Northern corn rootworm adult emergence data in first-year corn was also collected near Ithaca, NE, in 2004-2005 to document patterns in the field. Results are discussed within the context of what is currently known about extended egg diapause and the potential impacts on corn rootworm management in Nebraska.