Abstract
Abstract Blue spruce growing at a golf course in Northeastern Ohio were used to evaluate efficacy of selected pesticides against spruce spider mites. A ‘Skibee’ hydraulic sprayer at 100 psi with a narrow nozzle orifice was used to apply treatments to run-off. Three, single-tree replicates were selected at random for each treatment. The first application was applied to all trees 30 May under sunny skies, 15"C, and 0-16 km/h winds gusting to 23 km/h. The second application was made to selected trees 11 Jun under sunny skies, 18°C, and 3-16 km/h winds. Treatments were evaluated 1, 2, and 4 wks after the second application by removing four, 15 cm long branch tips from each of the 3 replicates/treatment. Samples were placed in plastic bags and transported, in coolers, to the laboratory. All samples were processed by passing them through a mite brusher 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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