Control of Citrus Rust Mite with Vendex, 1977

Vendex 50WP (0.125 lb and 0.50 lb ai/100 gal) was compared to Acaraben 4E (0.50 lb ai) in full season spray trials for citrus rust mite (CRM) control. Vendex formulated in water soluble bags was compared to the standard WP. Each treatment was applied to a single row of 40 mature grapefruit trees (15 ft x 25 ft spacing). Spray applications were made by a John Bean Model F-357 CP Speed Sprayer at 1 mph. Applications were made on May 3’77, Jul 9’77 and Sept 9’77. CRM counts were made at 30 and 60 days posttreatment. For each count, 10 fruit in each of 10 trees/treatment were examined for CRM and mite density was rated using the following scale: 0.0 = no mites; 1.0 = 1-5; 2.0 = 6-10; 3.0 = ≥10 mites per sample. A spray is normally recommended when CRM density ≥ 1.0/fruit. Rust mite damage evaluations were made at harvest on Nov 11 ‘77. Twenty fruit were randomly sampled from each of 10 trees, i.e., 200/treatment, and graded using the “United States Standards for Grades of Grapefruit” USDA Agric. Marketing Service Bui. Oct 1’69.