Hybrid Sterility: Mating Dynamics of Backcross Progeny from Crosses of Heliothis subflexa and H. virescens1,2

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Abstract
Backcross (BC) female progeny of crosses between Heliothis subflexa (Guenée) and the tobacco budworm, Heliothis virescens (F.), did not differ significantly from H. virescens females in mating synchrony and frequency of mating with BC (sterile) and H. virescens (normal) males. BC females received equal numbers of fertile matings as H. virescens females. When mated to BC males, both females were more receptive to additional matings than females mated with H. virescens males. Thus, the BC females behave similarly to, are as competitive and should be able to intermate with populations. Heliothis subflexa mated 2–4 h earlier than H. virescens, so the mating synchrony of H. subflexa was out of phase. Also, though H. subflexa females did mate infrequently with sterile BC males, H. subflexa females did not mate with BC or H. virescens females. Therefore, no influx of H. subflexa genes into released BC populations would be expected.

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