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Effects Of Aphid (Homoptera) Abundance And Surrounding Vegetation On The Encounter Rate Of Coccinellidae (Coleoptera), Chrysopidae (Neuroptera), And Nabidae (Hemiptera) In Alfalfa, James C. Kriz, Stephen D. Danielson, James R. Brandle, Erin E. Blankenship, Geoff M. Henebry
Effects Of Aphid (Homoptera) Abundance And Surrounding Vegetation On The Encounter Rate Of Coccinellidae (Coleoptera), Chrysopidae (Neuroptera), And Nabidae (Hemiptera) In Alfalfa, James C. Kriz, Stephen D. Danielson, James R. Brandle, Erin E. Blankenship, Geoff M. Henebry
Department of Entomology: Faculty Publications
Predaceous insect encounter rate was measured in 21 southeast Nebraska alfalfa fields through weekly sweep net sampling during 2002-03. The most frequently encountered predaceous insect families were Coccinellidae (Coleoptera), Nabidae (Hemiptera), and Chrysopidae (Neuroptera). The study used multiple regression analysis to examine the effect of aphid abundance and the surrounding vegetative patch composition on predaceous insect abundance. In 2002, Hippodamia parenthesis Say was encountered more frequently in fields with lower aphid abundances, and Hippodamia convergens Guerin-Meneville, Coccinella septempunctata L., and Nabis americoferus Carayon were encountered more frequently in fields with higher aphid abundances. In 2003, Coleomegilla maculata DeGeer was encountered …