Joshua H. Temple1, P. L. Bommireddy1, Paula Marcon2, Stephen Micinski3, K.D. Emfinger4, and B. R. Leonard4. (1) LSU AgCenter Department of Entomology, 404 Life Science Bldg., Baton Rouge, LA 70803, (2) DuPont Crop Protection, Stines Haskell Research Center, 1090 Elkton Road, Newark, DE 19711, (3) Red River Research Station, P.O. Box 8550, Bossier City, LA 71113, (4) LSU AgCenter, Macon Ridge Station, 212 Macon Ridge, Winnsboro, LA 71295
Laboratory bioassays were continued in 2007 to establish baseline toxicity data for Rynaxypyr (DPX-E2Y45) to selected Lepidopteran pests. Collections of larvae were made on various hosts from several states and established as colonies. The F1 generations of larvae were tested for susceptibility to Rynaxypyr using procedures for incorporating insecticides into meridic diets. Surveys of cypermethrin susceptibility in bollworm, Helicoverpa zea (Boddie), populations was continued in Louisiana during 2007. Bollworm moths were collected in pheromone baited wire cone traps at several Louisiana locations during May-September. The adult vial test (AVT) was used to monitor the seasonal susceptibility of male moths to cypermethrin. Selected bollworm colonies were tested for cypermethrin susceptibility using topical bioassay procedures.
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