Abstract
Activity of 34 isolates of the Heliothis nucleopolyhedrosis virus were characterized. Levels of LD 50 activity varied 56-fold from 0.7 to 39.0 polyhedral inclusion bodies (PIB)/mm 2 of surface-treated diet. At least two and possibly three to eight activity classes were delineated. Activity of one selected isolate increased ∼80% after 5 serial passes through Heliothis zea and remained unchanged during 11 additional passes. No change in activity was detected when another isolate was serially passed seven times.
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