The Activity of the Gypsy Moth Sex Attractant Disparlure vs. That of the Live Female Moth1

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Abstract
In simulated field tests in advance of the natural flight of Porthetria dispar (L.), laboratory-reared males were released, and the number attracted to traps containing live virgin females was compared with the number attracted to traps baited with formulations of disparlure, cis -7,8-epoxy-2-methyloctadecane, the newly synthesized sex lure of the gypsy moth. The lure was formulated with trioctanoin to regulate its volatility. Pure disparlure and many of its formulations attracted more males than did the live female. The attraction of the female was estimated to be equivalent to 1-6 μg of disparlure in 5 mg of trioctanoin. Information on the attraction of the synthetic lure relative to that of the females provides a basis for estimating the role of traps containing disparlure in the suppression of low-level or incipient populations of the gypsy moth.

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