Kairomones and their use for management of entomophagous insects : XI. Effect of host plants on kairomonal activity of frass fromHeliothis zea larvae for the parasitoidMicroplitis croceipes.

In laboratory experiments conducted to compare the kairomonal activity forMicroplitis croceipes (Cresson) of frass fromHeliothis zea (Boddie) larvae fed on different host plants,M. croceipes females responded to extracts of frass from larvae reared on cotton or soybeans but not on corn. The lack of response to frass from larvae reared on corn was shown to be a result of a lack of some appropriate chemical(s) in the corn.