Abstract
Abstract Treatments were applied to small blocks of 4-tree plots in a completely randomized design consisting of 4 replicates/treatment. Each plot contained one each of the cultivars: 'Red Delicious,' 'Golden Delicious,' 'Stayman,' and 'Rome Beauty.' The sprays were applied as complete applications with a Myers Mity Mist sprayer calibrated at 50 gal/acre, driven at 2 mph. Spray dates were as follows Savey 50WP (1 Jul), Plictran 50WP (1 Jul), Plictran 50WP plus Carzol 92SP (8 Jul), and Vydate 2L (17 Jul). A routine schedule of fungicides and insecticides (Dithane M-45, Benlate, Guthion, Lannate, Zolone, and calcium chloride) was maintained throughout the experiment. Effectiveness of the treatments on ERM was evaluated by counting the mites several times during the season on samples of 25 leaves/tree, 100 leaves/treatment ('Red Delicious'). The predator S. punctum was observed by making 3-min counts of adults and larvae around the periphery of the 'Red Delicious' trees.
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