Apple, Evaluation of Fenoxycarb for Tabm Control, 1987

Abstract

Abstract Experimental sprays were applied to 3-4 tree plots arranged in a randomized complete block design consisting of 6 replicates of alternating 'York Imperial' and 'Golden Delicious' trees. One 'York Imperial' and 'Golden Delicious' tree in the center of each plot was used for monitoring. All treatments were applied with a Friend Airmaster 393 airblast sprayer calibrated to leliver 50 gal/acre (complete spray), or 25 gal/acre, alternate-side spray, driven at 2.3 mph. The first 4 treatments were applied as complete sprays, whereas I he fifth, sixth, and seventh treatments were applied as alternate-side sprays. Dates of application were as follows: first and second treatments on 11 and 22 May, 20 and 29 Jul; third and fourth treatments on 1 and 15 Jun, 29 Jul, and 13 Aug; the fifth, sixth, and seventh treatments 1, 8, 15, and 22 Jun, 29 Jul, 7, 13, and 20 Aug. On 3 Jun an alternate-side application of Lannate 1.8L (710 ml/acre) was applied to all plots to control periodical cicada. Phosphamidon SEC (237 ml/acre) was applied as alternate side applications to all treatments on 6, 13, and 23 Jun and 10 Jul to control aphids. Vydate 2L (710 ml/acre) plus Carzol 92SP (227 g/acre) and Plictran 50WP (680 g/acre) were applied on 10 and 17 Jul, respectively, as alternate-side sprays to control mites. During the experiment, general maintenance sprays of Dithane M-45 and calcium chloride were applied to all treatments. Effect of treatments on ERM was evaluted by counting the mites several times during the season on samples of 25 leaves/tree ('York Imperial' only), 150 leaves/treatment. Effect of treatments 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 treatments on TABM was assessed by scoring for injury all apples on the center 'Golden Delicious' and 'York Imperial' trees at harvest and on all drops up to harvest. Pest pressure was moderate.