Effect of Experimental and Registered Miticides on Twospotted Spider Mite and European Red Mite, 1996

Abstract

Abstract This experiment was conducted in a commercial orchard of mature ‘Delicious’ apples at Arrowhead Ranch, Bridgeport, WA. The plot was laid out in 2 rows, with buffer trees between treated trees in the row, and a buffer row between rows containing treatments. A pre-treatment count was made and replicates were assigned to blocks according to initial population and treatments were randomly assigned within replicates. The experimental design was a randomized complete block with 4 replicates. Treatments were applied 5 Jul 1996 with a handgun sprayer operated at about 300 psi. Twenty randomly selected leaves were collected from each replicate tree, and mites were removed from the leaves with a leaf-brushing machine. Mites were counted with the aid of a binocular microscope. A pretreatment sample and weekly post-treatment samples were taken.