Abstract
Abstract Experimental sprays were applied to single-tree plots (mixed cultivars) arranged in a randomized complete block design. Each treatment was replicated 4 times. Each plot was surrounded by an adjacent single-tree plot that was treated twice during each brood with a combination of Lannate 1.8 L plus Asana XL to prevent TABM larvae from dispersing onto the treated trees. The trees were planted to a spacing of 18 × 24 ft. Treatments were applied with a truck-mounted John Bean sprayer, 35 gal/min pump, equipped with a handgun to thoroughly wet the trees. Approximately 5.4 gal of spray was applied/replicate tree (ca. 540 gal/acre). Dates of application were 8 and 19 Jun, 1, 14 and 22 Aug. During the experiment, general maintenance sprays of fungicides Rubigan and Dithane M-45 and calcium chloride as well as 1 complete spray (17 Jul) of Vydate 2 L plus Omite 30 W (for mite control) were applied to all plots. Effectiveness of chemicals on the tufted apple bud moth was assessed counting the number of shelters observed in a 5 min observation/tree and by scoring for injury all drops after 1 Jul and one picked sample of 150 apples/tree on 13 Sep. Apple samples averaged 192 apples/tree, 768 apples/treatment. Pest pressure was heavy.
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