The spatial distribution of western (WCR),Diabrotica virgifera virgiferaLeConte, and northern (NCR),D. longicornis barberiSmith and Lawrence, corn rootworm eggs in the soil was studied in eastern Nebraska under three types of water management systems for 5 years. Eggs were found deeper in the soil under dry conditions. The upper 10 cm of soil contained ca. 80% of the corn rootworm eggs in irrigated fields and ca. 45% in the dryland fields. Eggs were detected to a depth of 35 cm in nonirrigated fields. Under both irrigated and dryland conditions, WCR tended to oviposit more eggs between corn rows rather than in rows. The NCR oviposited significantly more eggs within the corn row in irrigated fields, but only slightly more were found in the rows of dryland fields. Generally, the WCR oviposited deeper in the soil than the NCR.