Abstract
Abstract Studies on the effect of parasitization by the endoparasitoid on host humoral immune reactions are carried out with the pupal endoparisitic wasp, Pteromalus puparum, and its host, Pieris rapae. Phenoloxidase (PO) activity of parasitized hosts hemolymph increased significantly at 12 h, day four and day five after parasitization. Hem‐agglutination activity of parasitized hosts hemolymph was always higher than that of wounded and unparasitized ones. Moreover, antibacterial activity of parasitized hosts hemolymph became more and more stronger, whilst wounded and unparasitized pupae only owned a weak antibacterial activity. It suggested that activities of humoral immune factors of Pieris rapae could be influenced to some degrees by P. puparum.
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