Apple, Campylomma Timing Test, 1992

The test was conducted in a young ‘Delicious’ orchard near Orondo, Washington. The experimental design was a randomized complete block, consisting of 4 replicates of three contiguous trees. Treatments were timed to coincide with tree phenology stages: HIG (half-inch green), applied 21 Mar; TC (tight cluster), applied 30 Mar; PK (Pink), applied 3 Apr; and FB (full bloom) applied 13 Apr. Treatments were applied to the point of drip with a handgun sprayer operated at 240 psi. Per acre rates were based on a 400 gal/acre dilute application. Nymphs were sampled by tapping limbs and catching nymphs on a 45 cm X 45 cm black cloth tray. One randomly chosen limb of each experimental tree was sampled on each date (three samples per replicate). Fruit evaluation was conducted after hand thinning and before fruit harvest. Forty apples per tree (or every apple on trees with less than 40 apples) were examined at both evaluation periods. Apples with one or more stings were considered culls.