Abstract
A nuclear polyhedrosis virus (NPV) isolated from Autographa californica (Speyer) infected a number of forest defoliators including Ennomos subsignarius (Hubner), Malacosoma americanum (F.), Eupsilia sp., Xylena curvimacula Morrison, Anisola senatoria (J. E. Smith), Alsophila pometaria (Harris), and Hyphantria cunea (Drury). Tests were conducted against all 4 larval stages of A. pometaria and against 3rd stage larvae of H. cunea . All stages of A. pometaria were susceptible to the Autographa NPV but younger instars were more susceptible than older ones. H. cunea also was susceptible to the Autographa NPV but its own NPV was more infectious. The LC50 of the Hyphantria NPV was 26 polyhedral inclusion bodies (PIBs)/mm2 compared to 1100 PIBs/mm2 for the Autographa NPV.
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