Abstract
An outbreak of armyworms, Pseudaletia unipuncta, occurred in widely separated sites in New England during the summer of 2001. Heavy mortality of caterpillars was noted in severely damaged suburban lawns and destroyed hayfields. Microscopic examinations of 90 moribund or recently expired caterpillars collected in Connecticut revealed a nuclear polyhedrosis virus (NPV) in 59 (66%) individuals from 5 of 6 sites. Virus development occurred in the nuclei and cytoplasm of the fat body. Based on ultrastructural studies, the NPV observed in Connecticut appears to be similar to a strain described earlier for armyworms in California and Hawaii.
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