Chemical Control of Thrips on Cotton, 1980

Two tests were conducted at the South Central Research Station, Chickasha, Oklahoma. In test 1, Pioneer Brand 4789A was planted on May 12 at 20 lb per acre in a McLain silty loam soil which had been treated with 0.75 lb of Treflan on March 20. Cotton plants in the 3 to 4 leaf stage were side dressed with granular materials on June 6 using a Dempster fertilizer attachment. Granules applied with a Noble granular chemical applicator were deposited 3 in into the soil and approximately 3 to 6 in from the plants. In test 2, Westburn M was planted on June 10 at 20 lb per acre in a Turtle silt loam soil. No herbicide applications were made prior to planting. Immediately after planting, rows were side dressed using the equipment and procedures previously mentioned. Eight-row plots, 150 ft replicated 3 times in a randomized complete block design were used in both tests. Thrips populations were determined by taking 10 plants from each plot and placing them in a berelese funnel for 3 hr. Rainfall amounts just prior and during the test were as follows: June 8, 0.15 in; June 9, 0.2 in; June 20, 1.2 in; and June 22, 0.68 in.