Evaluation of Insecticides for Control on Sunflower Moth, 1986

Abstract

Abstract This test was conducted in an irrigated field of sunflower located at the Southwest Kansas Branch Experiment Station near Garden City, KS. Seven insecticidal treatments and 1 untreated check were replicated 4 times in a randomized complete block design. Individual plots were 4 rows (3 m) wide by 12 m in length with 1.52 m separating blocks. Plots were irrigated and cultivated as needed. Insecticides were broadcast over-the-row using a backpack CO2-activated sprayer equipped with hollow-cone sprayer nozzles (TX6), The sprayer was calibrated to deliver 165.5 liters of finished material per hectare at an operating pressure of 2.1 kg/cm2. All treatments were applied on 23 Jul at 30% bloom and again on 30 Jul at 100% bloom. Temperatures at application (early morning) were 18.9�C and 17.8�C on 23 Jul and 30 Jul, respectively. Larval densities were determined by dissecting and examining 6 heads randomly selected from the center 2 rows of each plot. Heads were sampled 2 weeks after the first insecticide application. Total rainfall from the time of first application to posttreatment evaluation was 1.50 cm. Plots were not harvested for seed yield determinations because bird depredation of the maturing seed prevented reliable yield comparisons.