Apple, Insect and Mite Control, 1981

Ground and foliar applications of insecticides were applied to single-tree plots (6 yrs old) in a randomized block design consisting of 2 replicates of ,Stayman’ and 2 replicates of ‘York Imperial’. The Temik treatments were applied by hand on Apr 9 and incorporated with an orchard rake. The amitraz treatments were applied on May 14 using a handgun from a John Bean high pressure sprayer. General sprays of cyprex, captan, sulfur and Guthion were made at ca 2 week intervals during the season. Average temperatures were: Apr 53.2 F, May 59.9 F, Jun 69.9 F, Jul 73.2 F and Aug 70.0 F. Rainfall in inches averaged: Apr 3.23, May 3.17, Jun 4.11, Jul 2.79 and Aug 4.08. Effectiveness on the various mite species was evaluated by counting the mites several times during the season on samples of 25 leaves/tree, 100/treatment. The effect of the insecticides on WALH was determined by counting the number of nymphs on 25 leaves/tree. Effectiveness on AA and RAA was evaluated by counting the number of infested leaves/10 terminals/tree and the number of infested leaves on the whole tree, respectively. Pest pressure was heavy throughout the season.