Biological Activity of Lymantria dispar1 Nucleopolyhedrosis Virus from Living and Virus-killed Larvae2

Abstract
Polyhedral inclusion body (PIB) yields and biological activity of the gypsy moth, Lymantria dispar (L), nucleopolyhedrosis virus (NPV) were monitored at different times post-infection. PIBs harvested from dead larvae were up to 7 × more active than PIBs from living infected larvae. Virus yields increased up to ca. 2 × 109 PIBs/larva during the first 11 days and then remained constant.

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