Spider Mite Control in Dry Beans, 1986

Three spider mite control experiments were established near Twin Falls, ID. Treatments were replicated 4 times in a randomized complete block design at each location. Capture 0.04 + 0.04 lb (AI)/acre was a split application with 1 application being made at the same time the other products were applied and the second application 7 days later. All materials were applied in 27 gal finished spray per acre using a C02 pressurized backpack sprayer with 4 hollow cone nozzles on a 5 ft boom. Individual plots were 6 rows (11 ft x 25 ft long) in experiment no. 1 (application date 17 Jul) and plots were 3 rows (5.5 ft) x 25 ft in experiments 2 (application date 21 Jul), and 3 (application date 1 Aug). Six trifoliate leaves were picked weekly from the top, middle, and bottom portion of bean plants from each plot. The leaves from each plot were brushed using a Llanfair Orchards mite brush. Mites and mite eggs were counted under a microscope. Sampled leaves were also rated for percent leaf surface yellowed by mite feeding.