SUCCESS OF PARASITIZATION OF PSEUDEUCOILA BOCHEI WELD (HYM., CYNIP.): A MATTER OF EXPERIENCE by MARIANNE SAMSON-BOSHUIZEN, J. C. VAN LENTEREN and K. BAKKER (Zoological Laboratory, Department of Ecology, University of Leiden, The Netherlands) I. INTRODUCTION The females of the parasitic wasp Pseudeucoila bochei lay their eggs in larvae of different species of Drosophila. JENNI (1947, 1951 ) and N6STVIK (1954) studied the biology and morphology of the species. The ethology ( VAN DEN ASSEM, 1969) and ecology of this parasite are chosen as objects of study at our laboratory. The wasps discriminate between parasitized and non-parasitized hosts. Though at each oviposition a wasp lays only one egg, two or more eggs may be found in one host. However, the chance that an additional egg will be laid in a certain host at a later occasion decreases progressively with the number of eggs already present (BAKKER et al., 1967, 1972). Larvae of different species and ages are not parasitized to the same degree. Experiments on host selection have indicated that size, activity, and thickness of the cuticle of a host all are relevant factors in the pro- cesses involved (EIJSACKERS & VAN LENTEREN, 1970; BAKKER, 1971). We assumed that
Netherlands Journal of Zoology (in 2003 continued as Animal Biology) – Brill
Published: Jan 1, 1973
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