Acaricide Evaluation, 1992

Abstract

This experiment was conducted in a one-acre block of 6-yr-old trees on M7A, which measured 10 ft high and 7.5 ft wide and were planted 18 × 24 ft apart. The experimental design consisted of 4 single-tree plots in a randomized block design, with each replicate surrounded by at least one unsprayed tree on each side. Acaricides were applied on 15 Jun with an Agrotec handgun sprayer (model no. ASA0287) operated at 100 psi. Each tree received approximately 1 gal of spray (ca. 100 GPA). Other materials applied separately to the entire block throughout the season were Bayleton, Captan, Dodine, Ethrel, Javelin, Kocide, NAA, Nova, Solubor, Streptomycin, Supracide, Tenn-Cop, Topsin-M, and Ziram. In addition, Sevin and/or Lannate were applied to the entire block on 27 May, 8 and 25 Jun, and 9 Jul to exclude predators. European red mite control was evaluated by sampling 25 leaves from the periphery of each tree, removing mites with a mite-brushing machine, and counting motile stages with a binocular microscope.