Paul J. Semtner, psemtner@vt.edu1, Lakshmipathi Srigiriraju, pathi@vt.edu2, and T. David Reed, treed@vt.edu2. (1) Virginia Polytechnic Institute and State University, Southern Piedmont AREC, Blackstone, VA, (2) Virginia Polytechnic and State University, Southern Piedmont AREC and Department of Entomology, 2375 Darvills Road, Blackstone, VA
The seasonal abundance of the tobacco aphid, a tobacco-feeding form of the green peach aphid, Myzus persicae (Sulzer), the tobacco flea beetle, Epitrix hirtipennis (Melsheimer), and, soil inhabiting arthropods were studied on flue-cured tobacco grown in various combinations of cover crops, tillage practices, and insect management systems. This study included various combinations of tillage method (no-till, strip-till, and conventional tillage); cover type (sorghum, soybean, and wheat); and insecticide treatment (aldicarb preplant incorporated + acephate foliar spray, imidacloprid + spinosad, and untreated check). Soil inhabiting arthropods were sampled by pit-fall trap method every other week. All treatments were cultivated after transplanting and the final cultivation (layby) was normal in each tillage method. Flea beetles and their damage were much lower on tobacco grown in a no-till wheat cover than on conventionally tilled tobacco following the wheat cover. The tillage method had no significant effect on flea beetles or their damage in the sorghum and soybean covers. Tobacco aphid populations were much lower on tobacco grown in no-till and strip-till systems than in conventionally cultivated systems. Soil inhabiting arthropods, that were potential natural enemies of tobacco insect pests, were more abundant in the no-till and strip-till systems than in the conventionally tilled system early in the growing season. In 2004, strip-tillage produced cured leaf yields similar to those in conventional tillage, but yields were reduced significantly in the no-till treatments. The potential impacts of the tillage methods and cover crops and incorporation of this management practices on tobacco production are discussed.
Species 1: Hemiptera Aphididae
Myzus persicae (Green peach aphid)
Species 2: Coleoptera Chrysomelidae
Epitrix hirtipennis (Tobacco flea beetle)
Keywords: tobacco IPM
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