Abstract
Abstract Experimental insecticide treatments were applied in a comparative test to mature semi-dwarf Golden Delicious trees on 4 Apr (delayed dormant), 18 Apr (pink), 8 May (petal-fall), 22 May, 4 jun, 18 Jun, 2 Jul, 22 Jul, and 6 Aug. Treatments were applied with a hand gun using a Bean 35 gal/min hydraulic sprayer operating at 400 psi. Single trees were used and replicated 4 times in a randomized block design. Trees were sprayed to runoff. WALH populations were evaluated on 20 May by counting the adults and nymphs found on 25 randomly selected leaves per tree. (ERM) populations were evaluated on 28 May, 17 Jul and 12 Aug by randomly selecting 25 leaves/tree, brushing with modified Henderson-McBurnie mite brushing machine onto glass plates and counting mites and eggs with a binocular microscope. SP populations were evaluated on 9 Aug by counting all adults and larvae in a timed count of 3 min/tree. Attempts were made to count rosy apple aphid (Dysaphis plantaginea Passerini) and apple aphid (Aphis pomi DeGeer) in this trial, but populations did not develop on the control trees or on any treatments. On 18 Sep, 400 apples/treatment (100/rep) were harvested and evaluated. A fruit finish rating of 1 to 5 (5 being worst) was given each apple.
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