Abstract
AbstractA laboratory experiment was conducted to study the efficacy of nuclear polyhedrosis virus (NPV) with nine concentrations against all stadia of Plutella xylostella (L). The susceptibility of the larvae was correlated negatively with the period of development of the larvae and positively with the virus concentrations. The highest mortality of 84% was recorded in first stadium larvae compared to lowest mortality of 38% in fourth stadium larvae. The LC50 was 5.5 × 101 and 4.0 × 104 polyhedral inclusion bodies (PIB)/ml for first and fourth stadium larvae, respectively.
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