Abstract
Abstract Choke cherry (2-5 m) growing on a north-facing slope in a 1 hectare area were chosen 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 4, single-tree replicates containing 1 or more active tents. Treatments were applied May 7 when ambient temperature was 17-18°C with sunny skies and 15-20 kph winds. Conventional insecticides were first applied to tents and then to surrounding foliage. The Dipel treatment was concentrated on foliage surrounding the tents. Caterpillars were 20-25 mm long and were congregated on the sunny, south side of their tents when sprayed. Treatment effectiveness was evaluated 5 days later, and twice again at weekly intervals (B. treatment only), by counting the number of living and dead larvae in 1 tent per treated tree.
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