Spider Mite Control, 1987

Test plots were established south of Twin Falls, Idaho. The soil type was Portneuf silt loam and the field was surface irrigated. Two tests were conducted using foliar sprays to control TSSM. In both tests the insecticides were sprayed with a CO2 pressurized backpack sprayer at 30 psi and hollow-cone nozzles to apply a broadcast spray. Each acre received 50 gal finished spray. Test 1 was applied 29 Jul. Individual plots were 3 rows (22-inch row spacing) by 25 ft arranged in a randomized complete block design along the upper edge of the field. Five treatments and an untreated control were replicated 4 times. In Test 2 the plots were 6 rows by 50 ft and arranged in a randomized complete block design, with 3 rates of Capture and an untreated control replicated 6 times. Mites were counted approximately once each week by picking 6 leaves/plot from the middle rows (2 leaves each from the top, middle, and bottom of the plant canopy). The mites were brushed from the leaves and counted under a microscope. The data were subjected to ANOVA, and the means were separated using Newman-Keuls.