Graduate Thesis Or Dissertation

 

Pheromonal communication in the western cherry fruit fly, with particular reference to oviposition Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/2n49t4221

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  • Studies conducted with the adult western cherry fruit fly, Rhagoletis indifferens Curran, revealed that successful oviposition occurred in three distinct phases, the prepenetration phase, the penetration phase and the postpenetration phase. During the postpenetration phase which averaged 51 seconds (range 18 to 86), the females dragged their ovipositor over the fruit surface following the deposition of an egg. During this process, they apparently released and deposited a highly specialized pheromone which affected the behavior of incoming flies. The pheromone was soluble in methanol and water which indicated that it could be a polar compound. Methanolic and water extracts were stable and retained biological activity under laboratory and field conditions. The pheromone(s) was stable for at least two weeks at 3°C and did not lose its biological activity even upon heating to 80°C. The pheromonal compound(s) prevented repeated oviposition in a fruit already containing an egg, thus contributing to a uniform egg distribution throughout the available fruits. Identification and synthesis of the pheromone could result in its application in an integrated pest management program against the western cherry fruit fly.
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