Mating disruption of Douglas-fir tussock moth (Lepidoptera: Lymantriidae) using a sprayable bead formulation of Z-6-heneicosen-11-one
1994
Hulme, M. | Gray, T.
Polyvinyl chloride beads saturated with Z6-heneicosen-11-one, a synthetic form of the sex pheromone of the Douglas-fir tussock moth, Orgyia pseudotsugata (McDunnough), were applied using conventional aerial- or ground-spraying equipment. The aerial and ground treatments were each applied to three 2-ha plots, using 72 g/ha of the synthetic pheromone. During the 7 wk following spraying, traps baited with feral female moths caught 906, 0, and 3 male moths in the untreated, aerially-sprayed, and ground-sprayed plots, respectively. A similar catch ratio was obtained from traps baited with the synthetic pheromone. Egg masses, counted 3 mo after spraying, were not common in any of the plots, the numbers found being 32, 0, and 1 in the untreated, aerially-sprayed and ground-sprayed plots, respectively. Our results indicate that, for the first time in Canadian forests, spraying of a synthetic pheromone has essentially blocked all mate location and insect reproduction.
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