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Elevation of pheromone response threshold in almond moth males pre‐exposed to pheromone spray
Author(s) -
MAFRANETO A.,
BAKER T.C.
Publication year - 1996
Publication title -
physiological entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 57
eISSN - 1365-3032
pISSN - 0307-6962
DOI - 10.1111/j.1365-3032.1996.tb00858.x
Subject(s) - pyralidae , pheromone , lepidoptera genitalia , biology , sex pheromone , pheromone trap , zoology , botany , toxicology , horticulture
. 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 55–60%) 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.