Evaluation of Temik 15G Rates for Thrips Control as Influenced by Winter Cover Crop, 1997

Abstract

Abstract Plots were replicated four times in a RCB design with split-plot arrangement of treatments. Plots were 4 rows wide (40 inch spacing) X 45 ft. Winter vegetation was destroyed by applying Roundup Ultra (3 pts form/acre) approximately 4 weeks prior to planting. ‘StoneviUe 474’ cotton seed was planted on a Sharkey clay soil on 5 May in a stale seedbed system. The mean soil temperature on 5 May was 76.3° F at a depth of 2 inches, with marginal to adequate soil moisture. Cotton seed were planted with a John Deere 7100 series planter which was equipped with 10-inch seed cones mounted to replace the seed hoppers. The seeding rate was 4 seed/row ft. Granular in-furrow treatments were applied with 8-inch belt-cone applicators mounted to replace the standard granular applicators. Control of thrips was measured by randomly selecting 5 plants per plot at 7, 11, 15, 18, 22, 25, 30, and 35 days after emergence (DAE). Plant samples were washed to remove insects. Major pest and/or secondary pest control was initiated in Jun and continued on an “as needed” basis through Aug. Percent open bolls was determined on 3 Sep. Samples of 25 bolls/plot were collected and ginned on a laboratory gin to determined lint percentage for each plot. The two center rows were mechanically harvested on 19 Sep and 2 Oct using a John Deere spindle-type picker. Yields were converted to lb lint/acre.