Lesser Cornstalk Borer Control in Sweet Corn, 1985.

Abstract

Abstract Insecticide-treated and untreated corn seed were planted in Spaldinf Co., GA (‘Silver queen’) on 22 May (Test 1) and in Pike Co., GA (‘Truckers favorite’) on 3 Jun. Soil types were Cecil loamy clay in Test 1 ant! Appling sandy loam in Test 2. The tests were each arranged as a randomized complete block experimental design with 4 replicates. All plots were planted with a 2-row cone-type small plot planter (double-disk opener, press wheel, 32-inch row spacing). The planter was equipped with pressurized canisters for delivery of liquid insecticides (30 gal/acre at 20psi) and an electric metering unit for delivery of granular insecticides. Liquid anti granular formulations were applied at planting in a 7-inch band in front of each press wheel. Data were collected from 2-row × 30 ft plots in Tes; 1 and 2 row × 27 ft plots in Test 2. Each plot was bordered on each side by a row which received the same treatment. The numbers of healthy and LCB-damaged plants were counted in each plot 16 and 40 days after planting in Test 1, and 14 and 28 days after planting in Test 2. Each plan with LCB damage was identified by characteristic damage symptoms (dead or dying central whorl, or complete wilting) and also by the presence of LCB larvae or their silken feeding tubes which extend laterally in the soil from plant bases.