Submitted to: International Conference on Precision Agriculture Abstracts & Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 12/17/2001
Publication Date: 7/14/2002
Citation: ELLSBURY, M.M., CLAY, S.A., CLAY, D.E., MALO, D.D., CARLSON, C.G. INCREASED INCIDENCE OF EXTENDED DIAPAUSE IN NORTHERN CORN ROOTWORM AS EVIDENCED BY GEOREFERENCED ADULT EMERGENCE DATA. INTERNATIONAL CONFERENCE ON PRECISION AGRICULTURE ABSTRACTS & PROCEEDINGS. 2002. p. 148. Interpretive Summary:
Technical Abstract: Georeferenced grid samples for northern corn rootworm , Diabrotica barberi Smith and Lawrence (Coleoptera: Chrysomelidae) were taken over a 6-year period from two study sites in eastern South Dakota. A field in Moody County, SD was sampled in 1995, 1997 and 1999 and a second field in Brookings Co., SD was sampled in 1996, 1998, and 2000. Both sites were farmed in corn rotated with soybean and were sampled only during the corn phase of the rotation. Spatial variability in adult emergence at each site was characterized by semivariograms for each year of sampling and adult emergence distributions were graphically interpreted as contour maps overlaid on elevation for each field. Population levels of northern corn rootworm increased more than two-fold over three rotational cycles in both fields. Increases in adult emergence density occurred consistently in backslope and shoulder/summit areas of the experimental sites over the six-year monitoring period. The results suggest that a cropping system or management strategy as an alternative to the two-year corn/soybean rotation as practiced in the northern Great Plains may be needed to avoid pesticide use for management of extended-diapause northern corn rootworms.