Assays of Orchard-Applied Insecticides on the Brown Stink Bug (Hemiptera: Pentatomidae) Feeding on Pecan

摘要

The brown stink bug, Euschistus servus (Say) (Hemiptera: Pentatomidae), is an economic pest of pecan, Carya illinoinensis (Wangenh.) K. Koch (Juglandaceae), and other agronomic crops across the southeastern United States. The efficacy of many insecticides against E. servus attacking pecan is not well documented even though the label for many of these insecticides may indicate one or more stink bug species as targets. Thus, we assayed various insecticides, labeled for application to pecan, to determine efficacy against E. servus. Insecticides were applied to pecan limb terminals with nut clusters in orchards in Georgia and Texas during 2009 and 2010. Treated limb terminals were cut from the tree and taken to the laboratory 1, 4, and 7 d after treatment. Treated nuts or limb terminals (i.e., nuts and foliage) were placed individually in cups or cylinder cages, respectively, and adult E. servus then placed into these containers. Mortality and moribundity of E. servus were recorded at 24, 48, or 72 h in addition to rating feces production at 72 h in some trials. Results consistently indicate that bifenthrin provided greater control of adult E. servus for a longer time after application than other products, including the organophosphate chlorpyrifos. Aside from bifenthrin also affecting the feces rating, the only other treatment that reduced feces production compared with untreated nuts was lambda-cyhalothrin + thiamethoxam.