Abstract
Abstract Control of the periodical cicada was evaluated in a planting of mountainash trees (2-3 m) located in a heavy cicada emergence area. Treatments were randomly applied at the onset of egg laying activity and repeated twice at 7 d intervals. Five trees were sprayed/treatment with each tree serving as a single replication. The trees were sprayed until run-off including the trunk, foliage, and all branches using a Solo°8 liter hand pressure sprayer. Temperature at time of application was 27°C and wind velocity was less than 5 mph. Field evaluation of insecticidal efficacy for prevention of ovipositional damage was conducted 14 DAT when all cicada activity had ceased. Due to differing growth habits of the study trees, a standard insecticidal efficacy variable of mean number of wounds/branch was identified and defined as the quotient of the total number of ovipositional wounds/tree over the total number of branches/tree greater than 4 mm in diam.
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