Evaluation of Foliar-Applied Fenoxycarb for Tabm Control, 1989

Abstract

Abstract Experimental sprays were applied to 4-tree plots arranged in a randomized complete block design. Each plot contained the following cultivars: Delicious, Golden Delicious, Stayman, and Rome Beauty. Each treatment was replicated 4 times. Each plot was surrounded by an adjacent 4-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 12 × 35 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 4.2 gal of spray was applied/replicate tree (ca. 430 gal/acre). Dates of application for the fenoxycarb treatments were: 19 May, 8 Jun, 27 Jul, 16 Aug; for the Guthion treatment: 5 and 19 Jun, 3 Jul, 1, 14, and 28 Aug. During the experiment, general maintenance sprays of the fungicides Rubigan and Dithane M-45 and calcium chloride as well as 4 alternate-row applications (9, 14, and 23 Jun, 5 Jul) of Swat 8 E (for aphid control) were applied to all plots. Three alternate-row middle applications of Carzol 92 SP, Vendex 4 L and Omite 6 E were made on 26 May, 11 Jul, and 4 Aug, respectively. The effect of the treatments on mites was evaluated by counting the mites several times during the season on samples of 25 leaves/tree (cv Delicious only), 100 leaves/treatment. The effect of sprays on the mite predator S. punctum was evaluated by 3-min counts of adults and larvae around the periphery of the test trees. Effectiveness of chemicals on the tufted apple bud moth was assessed by scoring for injury all drops after 1 Jul and one picked sample of approximately 300 apples/tree on all cultivars in late Sep and early Oct. Apple samples averaged 331 apples/tree, 1324 apples/treatment. Pest pressure was heavy.