Abstract
Abstract Choke cherry (204 m) growing on a north-facing slope in a 0.5 hectare area were used for evaluating efficacy of selected insecticides. A CO2 compression sprayer operating at 40 psi with a TeeJet SS8004 flat fan nozzle was used to apply ca 1 liter of finished spray to each of 3, single-tree replicates containing at least 1 tent with living larvae. Treatments were applied May 15 when the ambient temperature was 16-18°C with cloudy skies and 24 kph winds. Spray was first directed to the tent(s) and then to surrounding branches and foliage. Treatment effectiveness was evaluated 5 days later and required 2-man-hours. One tent in each tree was dismantled, and living and dead caterpillars were counted.
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