Abstract
Abstract Treatments were applied to nonreplicated 1-acre plots consisting of 9-yr-old alternating ‘Golden Delicious’ and ‘Yorking’ trees. Five ‘Yorking’ trees were randomly selected for monitoring ERM and predators. The sprays were applied as alternate row middle applications with a Friend 309 sprayer calibrated at 50 gal/acre and driven at 2.3 mph. Spray dates were 15 and 22 Jun. A routine schedule of fungicides and insecticides (Dithane M-45, Benlate, Guthion, Lannate, Lorsban, and calcium chloride) was maintained throughout the experiment. Effectiveness of the treatments on ERM and Z. mali was evaluated by counting the mites several times during the season on samples of 25 leaves/tree, 125 leaves/treatment. The predator S. punctum was observed by making 3-min counts of adults and larvae around the periphery of the trees.
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