Abstract
Abstract A test was conducted in St. Landry Parish, LA to determine the efficacy of two soil insecticides and six foliar treatments for control of the insects listed above. Treatments were arranged in a CRB design with four replications. Plots were 4 rows wide (4 ft/row) and 46 ft long. Soil insecticides were applied on 10 Jun. The cultivar ‘Beauregard’ was transplanted 14 Jun. Foliar insecticide applications began three weeks after transplanting and were made at approximately weekly intervals. A CO2-pressurized back pack sprayer was used (30 psi) with a single row boom (20 inches wide) containing three nozzles (Cone Jet SX-10) and calibrated to deliver 15 gpa. Sweet potatoes were harvested on 13 and 14 Oct and field graded into U.S. number 1, 2, or 3. From each plot, in each of the 3 grades, 25 potatoes were randomly selected and evaluated for insect damage. The number of holes present caused by banded cucumber beetle, the number of potatoes with white grub feeding scars, and the number of potatoes damaged by whitefringed beetle were counted.
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