Paul Esker, pde@iastate.edu1, Kelly A. Cook, kcook8@uiuc.edu2, and Forrest Nutter, fwn@iastate.edu1. (1) Iowa State University, 351 Bessey Hall, Ames, IA, (2) Illinois Cooperative Agriculture Pest Survey, I-Building, Room 221 (MC 652), 1816 S. Oak Street, Champaign, IL
The role of Chaetocnema pulicaria Melsheimer as the primary vector of Pantoea (Erwinia) stewartii (Stewart’s disease of corn) has been extensively studied in both Illinois and Iowa. This is because management for Stewart’s disease principally relies on management of C. pulicaria. In Illinois, the economic impact of Stewart’s disease is on sweet corn production (yield loss), while in Iowa, seed corn production is at risk due to phytosanitary regulations for Stewart’s disease. These differences in disease risk greatly influences which management tactics cost-effectively reduce C. pulicaria populations, and therefore, the risk of Stewart’s disease. This talk focuses on three major research goals: (1) improved understanding of the economic threshold needed to recommend foliar insecticides to reduce yield loss in sweet corn in Illinois, (2) improved knowledge concerning the use of seed insecticides and/or delayed planting dates with regards of avoiding C. pulicaria populations and Stewart’s disease in Iowa, and (3) improved knowledge concerning the accuracy of site-specific predictions for the seasonal risk of Stewart’s disease. These management approaches will be discussed with regards to their efficacy on both low and high C. pulicaria populations. It is our contention that these areas of research may greatly influence if and when different management tactics are cost-effective.
Species 1: Coleoptera Chrysomelidae
Chaetocnema pulicaria (corn flea beetle)
Recorded presentation