Cherry, Chemical Control of Fall Webworm, Wayne Co., Ohio, 1978

Infested cherry (5-15 feet/1.5-4.6 m) growing along roadsides were used for evaluating efficacy of selected insecticides (see table). A Myers wheelbarrow sprayer operating at 200 psi was used to apply ca. 1 gal (0.95 I) finished spray per tree. Three randomly chosen, single-tree replicates, each having at least 1 web with living larvae, were used for each of the 7 treatments. Application was Aug 31 between 3:00 and 6:00 PM (EDT), when larvae were 25-40 mm long. Ambient temperature was 75°F (24°C) with clear sky and winds of 8-10 mph (12-15 kph). Spray was first directed to the tent(s) and then to surrounding foliage. Treatment effectiveness was evaluated 5 days post-treatment and required 2 man-hours. One tent from each tree (rep) was dismantled, and living larvae were counted.