Control of Bagworms on Arborvitae, 1980

Bagworm control was evaluated on an arborvitae hedge in two separate tests between June 10 and June 21. In Test 1, 120 feet of hedge were utilized and treatments were randomized and replicated three times. Each treatment consisted of an 8 ft section, 5 to 6 ft high. In Test 2, 270 feet of hedge were utilized and treatments were randomized and replicated three times. Each treatment consisted of a 15 ft section, 5 to 6 ft high. Treatments were sprayed until runoff with a John Bean 55 sprayer and a Spraying Systems Gun, Jet No. 43, which delivered 2.4 gal/min at 200 psi. Temperature and wind velocity at the time of treatment were 80°F, 0-3 mph and 90 F, 15-20 mph respectively for Test 1 and 2. Larvae were taken at ran-dom from 18 inches of terminal branch at 1, 3, and 7 days after application and mortality was determined by examining 10, 0.25 to 0.50 inch larvae from each treatment.