Abstract
Ovipositional acceptance tests with Microplitis croceipes (Cresson) were conducted in the laboratory using Heliothis virescens (F.) and the H. virescens-H. subflexa back cross. No differences in parasitism rates of the two host types were observed in petri dish bioassays. A similar lack of difference in parasitization of H. virescens and H. virescens-H. subflexa larvae was observed in field studies where hosts and parasitoids were released on caged cotton plants. Mean longevity and fecundity of female M. croceipes were not significantly different between H. virescens and the backcross. Also, there were no differences in developmental times for males and females between the two host types. Thus, augmentative releases of M. croceipes during or following a sterile backcross release should not adversely affect the backcross release ratio so the two control measures possibly could be used effectively together in an area-wide management program for control of H. virescens
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