Control of Spider Mites on Almonds, 1982

The test was conducted on 2-yr-old ‘Nonpareil’ almond trees in a commercial orchard near Shaffer, CA. A randomized complete block design composed of 12 blocks was established in the orchard. Each block contained 1 single-tree replicate of each of the 10 treatments. Treatments were applied on 23 Jul ’82, with a high pressure hand gun which delivers a fine spray at 400-450 psi. The trees were sprayed to runoff with an avg of 7.5 gal of dilute spray per tree, resulting in an application rate of ca 700 gal/acre. Five sample leaves were taken from each of the 4 compass quadrants of each tree, inside and outside of the canopy at heights of 3 to 6 ft, for a total of 20 leaves per tree. The samples were counted under a dissecting microscope. Only 6 of the 12 blocks were sampled on the pretreatment and 1 day posttreatment sample dates. Data for all other sample dates are based on counts from 12 blocks.