Apple, European Red Mite Control with Acaricides, Post Harvest Test, 1986

A 16 year-old apple orchard, variety ‘Stayman’ was used in this test. Single tree plots replicated 3 times in a randomized complete block design, were sprayed to runoff (ca 5 gal/tree) with a hydraulic sprayer equipped with a handgun and operated at 300 psi. Treatments were applied post-harvest (PH) on 7 Nov, 1985 and at pink (P) on 25 Apr, and petal fell (PF), 7 May, 1986. For disease control the entire orchard was treated with Captan and Polyram as needed. ERM counts were made by randomly picking 25 leaves/tree, brushing mites onto glass plates coated with Triton B-1956, and counting motile mites. Mite-days were calculated as follows: MD = MD1 + [(Ml + M2)/2 x Y], where MD1 = mite-days already accumulated, Ml = avg ERM/leaf on a given counting date, M2 = avg ERM/leaf on the next counting date after Ml and Y = no. of days between Ml and M2.