Chokecherry, Efficacy of Selected Insecticides Against Eastern Tent Caterpillar, Killbuck, Oh, 1982

Insecticides were evaluated for controlling eastern tent caterpillar larvae on 3 to 5-m chokecherry trees growing on a hillside. Finished sprays were applied with a CO2 compression sprayer operating at 40 lb/in with a TeeJet SS8004 flat fan nozzle. Applications were made on two dates: 10 May when conditions were 21°C (70°F) with sunny skies and winds calm; 20 May when it was 27°C (80°F) with cloudy skies and a slight breeze. Size of larvae on the two spray dates were 20 to 25 mm and 40 to 50 mm, respectively. Each treatment was applied to four, single-tree replicates that each received ca. 946 ml of finished spray. Sprays were directed first at nests and then to surrounding limbs and foliage. Five days posttreatment, nests were examined and mortality was assessed.