Abstract A 12-yr-old Early Redhaven peach block in Yakima, Washington, was used in this test. Low populations of McDaniel spider mite and European red mite were present in the orchard. All plots were sprayed to the point of drip with hand guns at 400 to 500 psi. Plots consisted of four single-tree replicates randomized throughout the block. Samples of mites were taken at weekly intervals by collecting 25 leaves/tree or 100 leaves/plot. Leaves were brushed with a mite brushing machine and mites counted under a binocular microscope.