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A paper to be submitted to the Journal of Economic Entomology Rachel Binning, Marlin Rice This study assessed the efficacy of two different genetic events, event Bt 11 (Cry1Ab) and event CBH351 (Cry 9C), in Bt corn against two instar classes of the stalk borer, Papaipema nebris (Lepidoptera: Noctuidae), across three different plant stages (V1, V3, and VS) of corn, Zea mays. Class A includes instars 1-2 and class B includes instars 3-4. Stalk borer response and development over time were measured and the data from 1999 and 2000 show that the Bt corn does have some effect on the feeding and development of P. nebris. Injury to the corn plant was reduced, although not eliminated. Stalk borer larvae caused significantly (P=0.0001) more injury to the non-Bt plants than to the Bt plants over time. Growth and development of the larvae were slowed and mortality was higher for Bt corn than for non-Bt corn. These data suggest that planting Bt corn may benefit growers by reducing, but not eliminating, stalk borer infestations and injury. Introduction The stalk borer, Papaipema nebris (Guenee) is a stem boring member of the Noctuidae (Lepidoptera) native to the United States (Decker 1931 ). The stalk borer's range extends east of the Rocky Mountains to the Atlantic Coast. The larvae are reported to feed on 176 different species of plants, including orchard grass, Dactylis

Effects of transgenic corn on the stalk borer, Papaipema nebris, and rearing techniques for the European corn borer parasitoid, Macrocentrus cingulum