Abstract
Abstract Cotoneaster growing in 1-gal (3.9 1) containers in a greenhouse at the main OARDC campus were used to evaluate efficacy of selected pesticides against two-spotted spider mites. A CO2 compression sprayer at 20 psi with a single Teejet SS8004 flat-fan nozzle was used to apply treatments to runoff. Infested plants were selected at random and placed in groups of 3 replicates/treatment. The first application was applied to all plants 25 Sep; the second application to selected plants 2 Oct. Plants were hand-watered every Mon, Wed, and Fri throughout the test period. Treatments were evaluated 1, 2, 4, and 8 wk after the second application by removing five, 10-13 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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