Choke Cherry, Chemical Control of Fall Webworm, Ashland Co., Ohio, 1979

Choke cherry (and 1 mulberry and 1 hickory) growing along a roadside were used to evaluate efficacy of selected insecticides against fall webworm. A Myers wheelbarrow sprayer operating at 200 psi was used to apply ca. 1 gallon (3.8 I) finished spray per each 3-5 m tall tree. Three, single-tree replicates, each with at least one viable colony of larvae, were used for each of the 10 treatments. Sprays were applied Aug 30 between 3:00 and 5:00 P.M. (EDT) when larvae were 2-3 cm long. Ambient temperature was 75-80 F (24-27°C) with clear skies and winds of 10-15 mph (16-24 kph). Spray was first directed to webs and then to surrounding foliage. Treatment effectiveness was evaluated 5 days post-treatment. One web from each tree (rep) was dismantled, and living and dead larvae were counted.