Abstract
Abstract A test was conducted in Evangeline Parish, LA, to determine the efficacy of two soil insecticides and three foliar applied insecticides for control of banded cucumber beetles and white grubs. Treatments were arranged in a CRB design with four replications. The cultivar ‘Beauregard’ was planted on 13 Jun. Plots were 4 rows wide (4 ft/row) and 50 ft long. Soil insecticides were applied on planting day and foliar insecticides were applied at approximately weekly intervals starting three weeks after transplanting (5, 15, 21, 28 Jul, 3, 11, 18,25 Aug, 1, 8 and 15 Sep.) A CO2 pressurized back pack sprayer was used (30 psi) with a single boom (20 inches wide) containing three nozzles (Cone Jet sx-10) and calibrated to deliver 25 gpa. Sweetpotatoes were harvested on 28 Sep and field graded into U.S. number 1,2, or 3’s. From each plot, in each of the 3 grades, 50 potatoes were randomly selected and evaluated for insect damage. The number of white grub feeding scars and the number of holes present caused by banded cucumber beetles were counted. All data were anlayzed by ANOVA and treatment means were separated by DMRT at P = 0.05.
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