Abstract
The effect of simultaneous infections of nuclear polyhedrosis virus (NPV) and granulosis virus (GV) of Heliothis armigera larvae was investigated. It was found that a mixture of the two viruses caused a lower rate of mortality than each of the viruses separately. In cases where the larvae were infected with one active and one inactivated virus, it was found that the latter does not interfere with the infectivity of the active virus, suggesting that the factor responsible for this interference is not present in the capsule protein as was found in some other insect species.
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