Abstract
Pheromone disruption experiments were carried out by releasing and recapturing laboratory-reared, whitemarked tussock moth (WMT), Orgyia leucostigma (J. E. Smith), males in small plots (324 m2). One plot was treated with (Z)-6-heneicosen-11-one, the Douglas-fir tussock moth pheromone, released from planchet evaporators at an estimated rate of 4.4 mg/plot/day (= ca. 140 mg/ha/day). In 14 replicates, 50% of the 864 released males in the untreated plot were recaptured but only 1.2% of 869 released males in the treated plot were recaptured. The average disruption was 97.6%. The same chemical was effective in disrupting pheromone communication of feral populations of WMT and pine tussock moth (PTM), Dasychira Plagiala (Walker), in similar small plot tests. Planchet evaporators, releasing the chemical at ca. 4.4 mg/plot/day, caused 92–100% disruption of PTM and 96–100% disruption of WMT. Commercially prepared hollow fiber dispensers, releasing pheromone at rates of 0.7, 1.2 and 1.6 mg/plot/day (= ca. 20, 40 and 50 mg/ha/day, respectively), caused 65–96% disruption of PTM and 76–92% disruption of WMT. (Z)-6-heneicosen-ll-one offers promise for pheromone communication disruption of several tussock moth species.
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