Residual activity of insecticides against adult Systena frontalis (F.) (Coleoptera: Chrysomelidae) under laboratory conditions

Presenting Author(s)

Rehan Arshad

Graduate Research Assistant
University of Georgia
Griffin, Georgia

Co-Author(s)

Shimat V. Joseph

Assistant Professor
University of Georgia
Griffin, Georgia

Systena frontalis (F.) (Coleoptera: Chrysomelidae) is a serious insect pest in nursery production as it can damage > 50 plant species. Although many insecticides are available for S. frontalis adult control, the residual activity of these insecticides is unclear. Thus, it is critical to characterize the residual activity of the insecticides for adult S. frontalis management. The objective of the study was to determine the residual activity of insecticides against adult S. frontalis in laboratory conditions. Twelve insecticides with distinctly different modes of action, such as chlorantraniliprole, cyantraniliprole, cyclaniliprole, flupyradifurone, flonicamid, azadirachtin, spirotetramat, imidacloprid, indoxacarb, pyrifluquinazon, bifenthrin, and sulfoxaflor + spinetoram were selected. The insecticides were foliar applied on the hydrangea shoots. Five S. frontalis adults were caged per shoot at 0 and 7 d after application. The insecticide treatments were replicated five times in a randomized complete block design under laboratory conditions. The number of live beetles, injured leaves, and the percentage of hydrangea leaf area damaged was quantified at 1, 3, and 7 d after adult introduction. For both 0 and 7 d exposure, cyclaniliprole significantly reduced beetle survival, incidence, and severity of foliage damage at 1, 3, and 7 d after adult introduction than other insecticides and nontreated control. Similarly, sulfoxaflor + spinetoram significantly reduced beetle survival for 0 d exposure at 3 and 7 d after adult introduction but not for 7 d exposure.