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Research into the identification of the sex pheromone in Bologna populations of Ostrinia nubilalis Hb. (Lepidoptera, Pyralidae) and related field tests



Research into the identification of the sex pheromone in Bologna populations of Ostrinia nubilalis Hb. (Lepidoptera, Pyralidae) and related field tests



Bollettino dell' Istituto di Entomologia della Universita degli Studi di Bologna 34: 15-25



In view of the contradictory indications in the literature on the relative proportions of the cis- and trans-isomers of 11-tetradecenyl acetate (TDA) approximating most closely to the natural female sex pheromone of the maize pest Ostrinia nubilalis (Hb.), further field and laboratory experiments were made on the subject in Italy, using populations originating from the Bologna area; the methods used to rear the larvae on artificial diets and to prepare the abdominal tips of adult females for analysis by gas chromatography are described. In the laboratory, the extracts of female abdominal tips contained a (Z):(E) ratio of TDA between 31:69 and 10:90, averaging 17.5:82.5. However, field experiments with different proportions of the isomers continued, as in previous years, to result in a statistically significant preferential attraction of male moths to extracts with a ratio of 2:98. Possible reasons for this are suggested, including the role of other so far unidentified chemical constituents in the attractiveness of the pheromone, and the possible chemical role of the artificial larval diet in the development of females more attractive to laboratory-reared males than to field-caught ones. The importance is stressed of determining the exact chemical composition of the sex pheromone in order that it may be used for the control of O. nubilalis.

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Accession: 000969186

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