'Pioneer 33A14' hybrid field corn was planted on 19 May at a rate of 30,000 seeds/acre. ... rootworm egg hatch was detected on 4 Jun. Cultivation treatments ...
(F26) CORN (FIELD): Zea mays L., 'Pioneer 33A14' Western corn rootworm (WCR): Diabrotica virgifera virgifera LeConte Northern corn rootworm (NCR): Diabrotica barberi Smith and Lawrence Terry A. DeVries & Robert J. Wright University of Nebraska-Lincoln South Central Res. & Ext. Center P.O. Box 66 Clay Center, NE 68933 Phone: (402) 762-3535 EVALUATION OF SOIL INSECTICIDES FOR CONTROL OF LARVAL CORN ROOTWORM, 1999: Planting and cultivation time insecticide trials were conducted at Clay Center, NE to evaluate their effectiveness for larval corn rootworm control. Local population consists predominately of WCR (>95% of total). All plots were in an insecticide-free trap crop during 1998. Soil insecticides were not applied to the plot area during three out of the five previous years. Experimental design was a RCB with four replicates. Each plot consisted of two 30-ft rows at 30-inch spacing. Soil type was a Crete silt loam with
