Apple, Campylomma Control on ‘Delicious’, 1994

The test was conducted in a 14-yr-old ‘Delicious’ orchard at the Tree Fruit Research and Extension Center. The experimental design was a randomized complete block with seven treatments and four single-tree replicates. The Lorsban 4E + dormant oil treatment was applied at half-inch green (29 Mar). All other treatments were applied at pink (7 Apr). All treatments were applied with a handgun sprayer to point of drip at 300 psi. Application rates were based on 400 gpa. Nymphs were sampled from two limbs of each replicate tree on each sampling date with the mean of the two samples representing that replication. A beating tray with black cloth (45 cm × 45 cm) was held beneath a limb that was struck sharply three times and the number of nymphs was then counted. Fruit damage evaluations were conducted 15 Jun and 30 Aug, just before commercial harvest. Forty fruit per replicate were examined on the tree for MPB damage. Fruit with one or more stings were classed as damaged.