Evaluation of Treated Seed and In-Furrow Insecticides for Control of Thrips on Cotton, 1997

Abstract

Abstract Insecticides were evaluated at the North Mississippi Research and Extension Center, Verona, MS in a RCB design with 4 replications. Plot size was 4 rows wide (38-inch row spacing) by 50 ft long. Liquid insecticides (Orthene 90 S, Admire 2 F, and Garlic Barrier L) were applied in-furrow at planting on 13 May using a CO2-powered plot applicator with a single 9001 VF flat-fan nozzles per row turned to direct the spray into the seed furrow and calibrated to apply 10 gpa at 2 mph. Temik 15 G was applied with a belt-cone granule applicator. Five plants/plot were collected at random by cutting plants at ground level with scissors and gently placing them into Ziploc bags for transport to the lab. Thrips were then washed off the samples onto filter paper for counting, and adults were identified to species under a dissection microscope. During the thrips evaluation, there was a total of 10.81 inches of rainfall, and adequate rainfall continued throughout the growing season. Yield was determined by mechanically harvesting the center two rows of each plot, and calculating yield based on measurement of the actual area picked. Yields are reported as lb of seed cotton per acre.