Acaricide Evaluation, 1988

Treatments were applied to 5 single-tree plots of 6-yr-old trees in a randomized block design consisting of 3 replicates of ‘Red Delicious’ and 2 replicates of ‘Golden Delicious.’ Applications were made with a Swanson DA500A airblast sprayer, which traveled at 2.4 mph and delivered a spray volume of 300 gal/acre at the delayed dormant stage and at 100 gal/acre for the remainder of the season. Other materials applied separately to all treatments were Asana, Benlate, Dithane M-45, Dodine, Guthion, Manzate 200, Penncap-M, Pounce, and Topsin-M. ERM control was evaluated by sampling 20 leaves from the periphery of each tree, removing mites with a mite-brushing machine, and counting active stages with a binocular microscope.