Kelly V. Tindall, Univ. of Missouri, P. O. Box 160, Portageville, MO 63873, B. Roger Leonard, LSU AgCenter, 212 Macon Ridge Rd., Winnsboro, LA 71295, and K.D. Emfinger, LSU AgCenter, Macon Ridge Station, 212 Macon Ridge, Winnsboro, LA 71295.
Feeding assays were conducted in the laboratory with fall, beet, and yellow-striped armyworms and salt marsh caterpillar to examine their ability to pupate on Non-Bt, Bollgard and Bollgard2 cottons. For fall armyworm and beet armyworm, individual squares were placed in 30ml plastic cups and one neonate larva was placed on each square. For yellow striped armyworm and salt marsh caterpillar, foliage and individual larvae were placed in a Petri dish. Mortality was rated 48h after infestation and every 2-3d after the initial rating until pupation. These experiments were initiated with 100 larvae per treatment and repeated three times. Larvae were provided with new plant tissue at each rating interval. The date of pupation and pupal weights were recorded for each larva that pupated. Data were analyzed in SAS using PROC MIXED to determine differences in mortality at each rating interval.
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