Apple, Integrated Test, 1979

Sprays were applied to single-tree plots in a randomized block design consisting of 2 replicates of York Imperial and 3 replicates of Golden Delicious. Treatments were applied with a Fri end Airmaster 393 sprayer at 25 gpa/alternate side spray driven at 2 mph. Spray dates for the insecticide treatments were: May 25, Jun 1, 12, 21, 29, Jul 6, 16, 25, Aug 2, 10, 17, 28, and Sep 4. Spray dates forthePydrin treatments were: May 25, Jun 4, 15, 26, Jul 6, 16, 25, Aug 3, 13, 25, and Sep 4. On Jul 26 and Aug 8, 227 g/acre of Plictran 50W was applied from the east and west sides of the test trees, respectively. Fungicides applied during the season were: Cyprex, polyram, sulfur, captan, zineb and calcium chloride. Average temperatures were: May 60.3°F, Jun 66.2°F, Jul 70.8°F, Aug 71.3°F, and Sep 64.3°F. Rainfall in inches averaged: May 4.03, Jun 2.41, Jul 3.19, Aug 4.88, and Sep 8.99. Effectiveness on the apple aphid was evaluated by counting the number of infested terminals/10 top terminals/tree, the number of aphid infested leaves/terminal, and the number of aphids/most infested leaf/infested terminal. The effect of the sprays on the white apple leafhopper was evaluated by counting the number of nymphs/25 leaves/tree. Effectiveness of test chemicals on the European red mite was evaluated by counting the mites several times during the season on samples of 15 leaves/tree, 75 leaves/treatment. The effect of sprays on the predators, S. punctum and H. vitripennis was evaluated by 3-min counts of adults and larvae and adults and numphs, respectively, around the periphery of the test trees. Effectiveness of chemicals on fruit feeders was assessed by scoring for injury all drops after July 9 and 2 pick samples on Aug 16 and Sep 17. Apple samples averaged 192 fruits/replicate and 960/treatment. Pest pressure was moderate to heavy throughout the season.