Control of European Corn Borer and Corn Earworm on Sweet Corn, 1997

Abstract

‘Jubilee’ was planted 25 Jun at the Uni-versity of Minnesota Agricultural Experiment Station at Rosemount, MN. Treatments were arranged in a RCB design with 4 replications. Plots consisted of 2 rows, 25 ft long with 30-inch row spacing. A single skip row separated each plot and 10-ft alleys separated the replications. Treatments were applied with a CO2-pressurized backpack sprayer using a single nozzle fitted with an XR-Teejet 8002 flat fan nozzle with no screen. The sprayer was calibrated to deliver 20 gpa at 34 psi, both rows of each 2-row plot were treated. Treatments were applied to the ear zone and began at 50% silk. Three applications were made 31 Aug, 5 and 11 Sep. Treatments were evaluated on 23 Sep by selecting 25 ears at random from each plot (100 per treatment) and recording the total number of larvae, larval size and location, and feeding damage (cm2).

Optimizing <I>Helicoverpa zea</I> (Lepidoptera: Noctuidae) Insecticidal Efficacy in Minnesota Sweet Corn: A Logistic Regression to Assess Timing Parameters

“…For all years, similar experimental design and insecticide application procedures were used. Methods for data collected from 1997 to 2002 were published in the Arthropod Management Tests of the Entomological Society of America (Burkness et al 1998(Burkness et al , 2003OÕRourke et al 1999;Wold et al 2002). For all years, plots were established at the University of Minnesota Outreach, Research and Education Park (UMORE Park) in Rosemount, MN.…”