Abstract
A high mortality from nuclear polyhedrosis was recorded when larvae of Aglais urticae and Porthetria dispar were each fed the nuclear-polyhedrosis virus of the other species. The two viruses are morphologically and serologically distinct, and it was shown that occult viruses had been activated in both species and cross-transmission had not occurred. It is suggested that the agent responsible for activation is the polyhedral protein of the activating virus.
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