Abstract
Abstract Acaricides were screened for efficacy against citrus rust mite on grapefruit. Treatments were completely randomized with each acaricide replicated on 3 mature trees. Tree spacing was 25 ft x 25 ft. To minimize chance contamination from spray drift trees in alternate rows were used for treatment. No emulsifiers or sticking agents were added; however, in one case an acaricide-citrus oil spray combination was tested. Treatments were applied by handgun of a Hardie Dilute Sprayer at 550 psi, ca. 20 gal spray per tree. Treatments were made initially on May 20, 1975 and reapplied on August 18, 1975. Leaf samples (20 per tree) were picked at two week intervals posttreatment and examined microscopically for rust mite. A leaf was considered infested if any living mites were found. Percent of infested leaves were averaged for the 3 replicates of each treatment.
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