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Science 17 August 1973:
Vol. 181. no. 4100, pp. 661 - 663
DOI: 10.1126/science.181.4100.661
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Articles

Insect Sex Pheromones: Minor Amount of Opposite Geometrical Isomer Critical to Attraction

Jerome A. Klun 1, O. L. Chapman 2, K. C. Mattes 2, P. W. Wojtkowski 2, Morton Beroza 3, and P. E. Sonnet 3

1 European Corn Borer Laboratory, Agricultural Research Service, U.S. Department of Agriculture, and Iowa State University, Ankeny 50021
2 Department of Chemistry, Iowa State University, Ames 50010
3 Organic Chemical Synthesis Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland 20705

(Z)-II-Tetradecenyl acetate is the reported sex pheromone of European corn borer and redbanded leafroller moths. However, geometrically pure preparations of the compound are weakly attractive to these species. Presence of the E geometrical isomer in the Z is necessary for maximum sex attraction and these moths are "tuned" to respond optimally to specific proportions of Z to E. This discovery is important to considerations of moth pheromonal specificity, evolution, and in application of knowledge of the pheromones to insect-pest suppression.


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