Journal of Biological Control

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Nuclear polyhedrosis viruses are transmitted through generations in two possible ways (Steinhaus, 1954; Aizawa. 1963). Transmission of virus through the contaminated egg surface is tenned as transovum whereas, transmission of the virus within the egg itself is designated as transovarial (Martignoni and Milstead, 1962). The time of application of nuclear polyhedrosis virus (NPV) in relation to egg hatching is a critical factor for achieving a high degree of effectiveness as observed in Heliothis spp. (House et al., 1976). Hence. the present investigation was taken up to study the effect of different concentrations of the virus when applied on eggs of different ages of Plutella xylostella (L.).

Keywords

NPV, Plutella xylostella, Eggs, Control.
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