Abstract
Of the four imported insect parasites of Ostrinia nubilalis (Hubner) which were established in Connecticut in 1954, only an ichneumonid, Eriborus terebrans (Gravenhorst), and a braconid, Macrocentrus grandii Goidanich, were recovered in fall and spring surveys conducted from 1978–1981. E. terebrans was collected from one location only and occurs at a very low level. M. grandii is widespread and sufficiently abundant in some areas to possibly aid in the natural suppression of the European com borer (ECB). M. grandii emergence from ECB larvae in the spring is well synchronized with emergence of ECB adults, and this parasite appears well adapted to the seasonal occurrence of the ECB in this region. Native parasites found include two tachinid flies, Aplomya caesar (Aldrich) and Lixophaga sp. Both are widespread but account for less than 6% of total parasitism, and neither parasite appears to have a significant controlling effect on ECB populations.
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