Identification of sex pheromone components from pheromone gland volatiles of the tomato looper,Plusia chalcites (Esp.) |
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Authors: | E. Dunkelblum R. Snir S. Gothilf I. Harpaz |
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Affiliation: | (1) Institute of Plant Protection, ARO The Volcani Center, 50 250 Bet Dagan, Israel;(2) Department of Entomology, Faculty of Agriculture, Hebrew University of Jerusalem, 76 100 Rehovot, Israel |
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Abstract: | The sex pheromone glands ofPlusia chalcites release, dodecyl acetate, (Z)-7-dodecenyl acetate, (Z)-9-dodecenyl acetate, 11-dodecenyl acetate, (Z)-8-tridecenyl acetate, and (Z)-9-tetradecenyl acetate. A combination of capillary GC, GC-MS, and dimethyl disulfide derivatization enabled a rigorous identification of all these compounds, some of which were previously found in gland extracts. Bioassays in a flight tunnel showed that a ternary blend of (Z)-7-dodecenyl acetate, (Z)-9-dodecenyl acetate, and (Z)-9-tetradecenyl acetate elicited directed flights from 85 to 100% of the males tested and elicited copulation attempts, at the end of the flights, from 44 to 74% of the males tested. This blend was equal in activity to the natural gland extract. Addition of the other acetates had only a slight influence on the activity of this mixture. Substitution of either (Z)-9-dodecenyl acetate or (Z)-9-tetradecenyl acetate in this blend by 11-dodecenyl acetate gave two ternary mixtures which also elicited high levels of courtship activity, almost as high as that of the original blend. Addition of (Z)-7-dodecenyl alcohol inhibited almost totally the flight activity of males.Lepidoptera: Noctuidae.Contribution from the Agricultural Research Organization (ARO) No. 1701-E, 1986 series. |
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Keywords: | Plusia chalcites Lepidoptera Noctuidae sex pheromone identification flight-tunnel bioassay (Z)-7-dodecenyl acetate (Z)-9-dodecenyl acetate (Z)-9-tetradecenyl acetate |
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