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Four, 4- tree replicates were sprayed on one side with selected Pounce dosages and a water check on each treatment date (May 9, 18, 25, Jun 5, 12, 19, 26, Jul 3, 11, 19, 30, Aug 6, 13, 20,27, Sep 4). Each replicate consisted of the cultivars Triple Red Delicious, Golden Delicious, Double Red Stayman and Commander Red York on the rootstocks MM106, M7, MM106 and MM111, respectively. Unsprayed buffer trees were left between each replicate to minimize drift. The side of the tree sprayed was alternated on each successive spray date. The experiment was set up as a two-way analysis of variance with treatments and varieties as classes. All applications were made with a Swanson airblast sprayer calibrated to deliver 25 gpa (233.55 liters/ha) at 2 mph ground speed (3.22 km/hr) with 100 psi (7.03 kg/cm2) pump pressure. To insure sufficient pressure from C. pomonella each tree was inoculated with approximately eight late instar larvae (1000 in the 130-tree block) on May 13. Corregated cardboard strips containing the larvae were stapled to the trunk of each tree. Each strip was covered with a strip of aluminum foil that extended one-fourth inch (0.635 cm) beyond the edges of the cardboard to (1) reflect sun rays, (2) deflect water, and (3) discourage bird feeding. To determine the effect of Pounce on early season pests of apple, 10 leaf clusters/tree were chosen at random and examined for fruitworm, leafhoppers, aphids and leafrollers (Table 1). On May 25 and Jun 6, ca. 50 apples/tree were examined for damage by plum curculios, tarnished plant bugs and fruitworms. These data are recorded as percent damaged fruit (Table 2). Beginning on Jun 18 codling moth damage (stings and entries) was assessed as for plum curculios, tarnished plant bugs and fruitworms. When the fruit began to drop the fallen apples were collected and examined for codling moth injury (Table 3). Maintenance spraying was primarily for suppression of apple scab and cedar rust. During the season the following (6X concentrate) fungicides were applied: Polyram 12 lb/100 gal (14.38 g/liter), Dikar 10 lb/100 gal (11.98 g/liter), captan 50W 10 lb/100 gal (11.98 g/liter), captan 50W 10 lb/100 gal (11.98 g/liter) + Cyprex 65W 5 lb/100 gal (5.99 g/liter), and Cyprex 5 lb/100 gal (5.99 g/liter). Three-pound fruit samples were collected at 0, 3, 7, and 14 da following the last application for residue analysis by the manufacturer and will be reported on separately.

Apple, Evaluation of Full Season Postbloom Spraying (Alternate Row Technique) with Two Rates of Pounce, 1979