RESIDUAL ACTIVITY OF CHLORANTRANILIPROLE AND OTHER TURFGRASS INSECTICIDES AGAINST BLACK CUTWORM (LEPIDOPTERA: NOCTUIDAE)

摘要

Black cutworm,Agrotis ipsilon (Lepidoptera: Noctuidae),can be an extremely damaging pest in golf course putting greens.To control this pest,turfgrass managers typically apply insecticides preventively or curatively.Many products labeled for black cutworm have limited residual activity,and therefore multiple applications are required during each growing season.The objective of this study was to assess residual efficacy of two neonicotinoids (clothianidin and thiamethoxam) and an anthranilic diamide (chlorantraniliprole) after a single application,and to determine whether the use of a plant growth regulator (paclobutrazol) results in prolonged residual efficacy of the insecticide treatments.Turfgrass plots were treated once in June of two growing seasons (2009 and 2011) and infested with a cohort of black cutworm larvae every two weeks.The results of this field study suggest that single applications of chlorantraniliprole and thiamethoxam may be able to provide season-long control of black cutworm larvae in regions with moderate growing seasons (e.g.the Midwestern United States).The results indicate that paclobutrazol,a plant growth regulator,did not affect residual efficacy.This work also illustrates the potential for certain abiotic factors (i.e.,prolonged,hot weather) to reduce the residual efficacy of insecticide treatments.