Abstract
The particulate fraction of the calyx fluid of the endoparasitoid, Campoletis sonorensis, reduces host weight gain when manually injected into healthy Heliothis virescens larvae. Reduced weight gain of the host, H. virescens, is normally associated with parasitism by C. sonorensis. Electron microscopy has confirmed that the particulate fraction of the calyx fluid is composed of virus particles and it appears that this virus, injected with the egg at oviposition, actually reduces host weight gain. The effect of the virus is negated when the calyx fluid is exposed to ultraviolet light prior to injection. Furthermore, the calyx fluid is effective only if injected into hosts; there is no effect on host weight gain when hosts are fed or topically treated with the virus-containing calyx fluid.
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