Relative toxicity of the nuclear polyhedrosis virus of Spodoptera mauritia (Biosduval) to different larval instars of the host

Abstract

Bioassay of the NPV of Spodoptera mauritia (Biosduval) showed that LC50 increased with larval age. The LC50 ranged from 3558 PIBS/ml for the second instar to 808700/ml for sixth instar. An inverse relationship between LTSO and concentration of the virus was observed.