Larval parasitism of 3 Psilocorsis species in central Missouri forests averaged 22% for the years 1977-1979. Twenty-three species of parasitoids were reared in the laboratory from the larvae collected. Seventeen species emerged from P. reflexella Clemens, 14 from P. quercicella Clemens, and 10 from P. cryptolechiella (Chambers). The most abundant parasitoids were the braconids Apanteles n. sp., Agathis calcarata (Cresson), and A. cincta (Cresson); the eulophid Elachertus proteoteratis Howard; the ichneumonid Diadegma psilocorsis Walley; and the 3 closely related pteromalids, Perilampus fulvicornis Ashmead, P. prothoracicus Smulyan, and P. n. sp. Elachertus proteoteratis was reared only from P. reflexella. Twenty-three new host records were obtained--9 from P. reflexella, 8 from P. quercicella, and 6 from P. cryptolechiella. Nine parasitoids reared in this study were previously reported from the same Psilocorsis host species. Sex ratios and adult emergence periods were reported for some of the most abundant parasitoid species.
- oak leaftiers,
- larval parasitism
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