Abstract
Abstract Balsam fir (3-4 m high) growing at the OSUOARDC Pomerene Forestry Research Facility near Coshocton, Ohio, were used to evaluate acaricides against spruce spider mite. Treatments were assigned in a randomized complete block design with 4 single-tree replicates. Treatments were applied with a KWH backpack mistblower operating at 0.5 throttle on aperture setting 4 for 75 s to deliver 1892 ml of finished spray/tree. Applications were made 30 Jul under sunny skies at 30°C and no breeze. Treatments were evaluated 6 Aug by removing 5 branch ends 10-15 cm long from each tree and transporting them in paper bags in an air conditioned vehicle to the laboratory. All samples were processed by passing them through a mite brush 6 times to dislodge mites to a rotating glass plate coated with Tween-20. Dislodged mites were counted with the aid of a binocular dissecting microscope.
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