Department of Entomology NYS Agric. Expt. Station Geneva, NY 14456 Thrips Control on Onions, 1994

This experiment was located in Prattsburg, New York, on Franjo Farms and was designed to compare labeled compounds. Treatments, replicated four times, were planted on 3 May and consisted of two rows (20 ft long) with a 5 ft buffer separating replications. Two unsprayed buffer rows were located between treatments. The plot was completely randomized. Sprays were applied using a CO2 backpack sprayer equipped with 4 nozzles delivering 100 gal water/acre. A sticker (Bond) and a wetter (Silwet) were applied with all treatments at the rate of 8 ft oz/100 gal. Thrips counts were made on 10 plants/treatment/replication by direct field observation using a 10X head visor. This test was designed to determine if a weekly spray schedule of labeled compounds had any effect on yields when compared to a treatment threshold spray program of 3 thrips/leaf. Applications were initiated on 25 Aug. Only two weekly sprays and one threshold spray were applied since thrips populations did not begin to increase until late season.