Elevation of pheromone response threshold in almond moth males pre-exposed to pheromone spray

A. Mafra-Neto, Thomas Charles Baker

Research output: Contribution to journalArticle

25 Scopus citations


High percentages of naive Cadra cautella (Walker) (Lepidoptera: Pyralidae) males not pre-exposed to pheromone flew upwind to sources containing 50 ng (83%) and 500 ng (97%) of pheromone, but not to sources containing 5 μg (23%) and 50 μg (4%). Of the naive males that flew upwind in response to 50 ng sources, 67% located and landed on the source, whereas fewer than 19% of the naive males that flew upwind in response to higher doses located and landed on the sources. A 2-minute pre-exposure of C. cautella males to a spray cloud containing 50 ng, 500 ng, 5 μg or 50 μg of pheromone, induced shifts in response levels such that in wind-tunnel bioassays performed 1 h later, there was an increase in the doses that optimally elicited upwind flight and landing on the source that was proportional to the pre-exposure dose. Few of the pre-exposed males flew upwind to (10-43%) and landed on (0-33%) 50 ng sources, whereas they now perferentially flew upwind to (58-81% and 52-73%) and landed on (33-68% and 5560%) pheromone sources of doses of 500 ng and 5 μg, respectively. Therefore pre-exposure to pheromone promoted a shift of threshold for response, and not an overall reduction in responsiveness to pheromone.

Original languageEnglish (US)
Pages (from-to)217-222
Number of pages6
JournalPhysiological Entomology
Issue number3
StatePublished - Jan 1 1996


All Science Journal Classification (ASJC) codes

  • Physiology
  • Ecology, Evolution, Behavior and Systematics
  • Insect Science

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