Abstract
Abstract Fraser fir (1-2 m high) growing at a Christmas tree plantation in State College, Pa., were used to evaluate acaricides against spruce spider mites. Treatments were assigned to heavily infested trees at random and consisted of 4 single-tree replicates. Pretreatment counts indicated 182 mites/single-tree sample. Treatments were applied with a KWH backpack mistblower operating at half throttle on setting 3 for 40 s, delivering 910 ml of finished spray/tree. The first application was made to all trees 21 May under cloudy skies, 18°C, and 8-16 km/h breeze. A second spray was applied to some of the trees 2 Jun under partly sunny skies, 27°C, and 0-16 km/h breeze. Treatments were evaluated 1, 2, 4, and 8 wk after the second application by removing four 10-15-cm-long lateral branch tips from each of the 4 replicates/treatment. Samples were transported in coolers or insulated boxes and shipped by overnite carrier. All samples were immediately processed by passing them through a mite brush 6 times to dislodge mites to a rotating glass plate coated with Tween 20. The number of live mites was counted with the aid of a dissecting microscope.
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