Abstract
Abstract Two trials were conducted in a 4-yr-old mixed ‘Delicious’ and ‘Gala’ orchard with under-tree sprinkler irrigation. Guthion 50WP (1.3 lb form./acre) was applied for codling moth control on 11 May, 2 Jun, and 8 and 28 Jul. The experimental design was a randomized complete block with 5 single-tree replicates per treatment. Dilute sprays were applied to runoff with a handgun sprayer (Rears Mfg., Bend, OR) operated at 150-200 psi. Per acre rates were based on application of one gal of spray per tree or 182 gal/acre. Triton B-1956 spray adjuvant was tank-mixed with all treatments at 11.7 fl oz/acre. Aphids (alate + apterous) were counted in situ on the three most recently fully expanded leaves (minimum of 1 inch in length and edges completely unfolded) on three randomly selected terminals per tree. In Trial 1, ten treatments were applied once following pretreatment counts on 2 Jun. Initial aphid densities were low. In Trial 2, five treatments were applied on 19 Jul immediately following pretreatment counts, and then again on 2 Aug except for Admire. Initial aphid densities were high. Post-treatment counts were made weekly.
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