Apple, Secondary Pest Experiment, 1990

Abstract

Abstract Experimental sprays were applied to single-tree plots in a randomized block design consisting of 2 replicates of'Golden Delicious' and 2 replicates of'Yorking'. Treated single trees were separated by others not sprayed with insecticides. The trees were 6-yr-old and planted to a spacing of 20 × 30 ft. Carzol treatments were applied as alternate side applications with a Myers Mity Mist sprayer calibrated to deliver 50 gal/acre at 2.0 mph for a complete spray. The Swat treatment (14 and 28 Jun) and the Safer Soap and oil treatments were applied with a John Bean sprayer, 35 gpm pump, equipped with a handgun. Approximately 3.3 gal of spray were applied per replicate tree (ca 240 gal/acre). All plots were oversprayed with Dithane M-45 on a biweekly schedule.