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Sex pheromone specificity in Heliothis

Tingle, F.C., Mitchell, E.R., Baumhover, A.H.
Journal of chemical ecology 1978 v.4 no.4 pp. 471-479
Heliothis subflexa, Heliothis virescens, Helicoverpa zea, sex pheromones, sex attractants, trapping, pheromone traps, backcrossing, hybrids, mating behavior, olfactometry, wind tunnels, nocturnal activity
Electric grid traps baited with Heliothis subflexa (Guenée), H. virescens (F.), or H. zea (Boddie) females captured conspecific males with few exceptions.Heliothis subflexa females reduced the attraction ofH. virescens and H. zea males when used as bait simultaneously with females of either of these two species. Backcrosses were made with H. virescens males and female hybrids from a cross between H. subflexa females and H. virescens males. The backcross (BC) females and H. virescens females attracted approximately equal numbers of H. virescens males in field traps. BC males released in field cages were attracted to H. virescens females and to the synthetic pheromone of H. virescens. When laboratory-reared male H. virescens, BC males, H. subflexa males, and F1 hybrid males were exposed to the synthetic pheromone of H. virescens in Plexiglas wind tunnels, H. virescens males and BC males responded to the pheromone, but H. subflexa and F1 hybrid males did not. The peak activity of bothH. subflexa and H. zea males occurred approx. 4 hr after sunset. Male H. zea were active throughout most of the night; male H. virescens were most active approx. 6 hr after sunset.