Super- and multiparasitism of Delia radicum L. (Diptera : Anthomyiidae), by two Aleochara species.

The super and multiparasitim of D. radicum pupae by two Aleochara species h ave been studied. A. bilineata and A. bipustulata are naturally in competit ion for the exploitation of this host Our results show that the first insta r larvae of the two coleoptera can discriminate between unparasitized pupae and parasitized pupae and more specifically, between pupae parasitized by a conspecific larvae and pupae parasitized by another species. Equally, the y show that the choice of penetrating a parasitized pupa, is strongly influ enced by the identity and the development stage of the first installed larv a.