![]() ![]() A comparison of responses from olfactory receptor neurons of Heliothis subflexa and Heliothis virescens to components of their sex pheromone. ![]() Effect of juvenile hormone on the central nervous processing of sex pheromone in an insect. Possible explanations for these unexpected findings are discussed.Ī nton, S. Contrary to our expectations: 1) females did not respond more strongly to a pulsed pheromone stimulus than to the constant release of pheromone at the same average release rate and 2) we did not find a relationship between the frequency of abdominal pumping and pheromone release rate. We also tested the hypotheses: 1) that abdominal extrusion per se increases the rate of pheromone release and 2) that greater abdominal pumping rhythm increases pheromone release rate. ![]() ornatrix are more sensitive to the complete blend of pheromone than to its individual compounds. Some females even initiated calling during photophase when exposed to the pheromone components. ![]() When females were exposed to the entire pheromone or to two of its (synthetically prepared) components, ( Z, Z, Z)-3,6,9-eicosatriene and ( Z, Z, Z)-3,6,9-heneicosatriene, they were more likely to call during a given night, begin calling earlier, and briefly increase signal frequency with which they extrude their abdomen, an observable indication of calling in this species. We found five olfactory-active compounds in the U. Perception of the female sex pheromone in Utetheisa ornatrix (Lepidoptera: Arctiidae) is responsible for induction and adjustment of calling by females and the collective phenomenon termed “female pheromonal chorusing”. ![]()
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