Apple, Tests of New Compounds Against OBLR, 1994

Abstract Treatments were applied with a high pressure handgun sprayer (450 psi) to single-tree plots in two orchards in Western NY. In the LaMont orchard the ‘Tdared’ trees were ca. 12 years old, 4.2 m high, and planted 4.9 by 5.5 m apart. In the Brown orchard the ‘Mcintosh’ and ‘Delicious’ trees were ca. 3.0 m high and planted 4 by 6.7 m apart. Treatments were arranged in a RCB design and replicated four times. Treatments were applied on 11 and 25 Jul in the Brown orchard and on 12 and 26 Jul in the LaMont orchard. Larval populations were compared by examining 20-25 actively growing terminals/tree in the LaMont orchard on 26 Jul and 2 Aug and on 22 Jul and 2 Aug in the Brown orchard. Fruit damage from the first summer generation of larvae was estimated on 22-23 Aug by sampling a total of 300-500 apples from each tree. Fruit damage was assessed at harvest on 16 Sep in the Brown orchard and on 22 Sep in the LaMont orchard. Damaged fruit was graded using USDA standard grades of Fancy, #1, and culls. Data were analyzed using Fisher’s Protected LSD Test. Data were transformed (arcsine( squareroot x)) prior to analysis.