Abstract
The individual impact of two microsporidia and a nuclear polyhedrosis virus infection within larvae of the European corn borer, Ostrinia nubilalis, on a tachinid parasitoid, Lydella thompsoni, was studied. Nosema sp. primarily infected the Malpighian tubules and muscle tissue of the O. nubilalis hosts. Pupation of L. thompsoni from hosts infected with Nosema pyrausta or Nosema sp. and eclosion of adult L. thompsoni after development in N. pyrausta-infected hosts was not significantly (α = 0.05) reduced. However, no L. thompsoni were able to eclose as adults after development within Nosema sp.-infected O. nubilalis larvae. Infection of O. nubilalis larvae by a mint looper, Rachiplusia ou, nuclear polyhedrosis virus (Ro MNPV) did not significantly (α = 0.05) affect pupation or eclosion of L. thompsoni. Viral polyhedral inclusion bodies were found within the alimentary canal of L. thompsoni maggots within Ro MNPV-infected O. nubilalis hosts.
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