Abstract
Abstract Treatments were applied with a truck-mounted, high pressure (450 psi) handgun sprayer dilute to singletree plots of ‘Empire’ apples that were 10.5 ft high and planted 14 by 21 ft apart. Treatments were in a RCB design, replicated three times. Plots were separated by an unsprayed buffer tree. This test was designed to compare the effectiveness of acaricides against high summer mite populations. The first spray was applied on 18 Jul, when mite populations in the orchard exceeded recommended threshold levels of 5.0 mites per leaf. All plots were retreated on 28 Jul. ERM were counted on 25 randomly selected intermediate-aged fruit cluster or spur leaves in the laboratory using a dissecting microscope at zero, three and seven days after the first treatment. After the second spray, mites were counted on 25 randomly selected leaves/tree at weekly intervals. Mites were removed from leaves of samples after the second spray with a Henderson-McBurnie mite brushing machine.
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