Pot experiments carried out to study the efficacy of nucleopolyhedrovirus against the Bihar hairy caterpillar Spilarctia obliqua (Walker), at Bangalore indicated that a spray of NPV @ 1×107 POB ml−1 resulted in a larval mortality of 93.33% in third instar larvae and 87.5% in fourth instar larvae. Cent per cent larval mortality was obtained when the plants were sprayed with dichlorvos @ 2 ml l−1. The leaf damage for viral treatments varied from 19.65 to 41.89 and 21.0 to 38.0 per cent for third and fourth instar larvae, respectively.
Keywords
Mulberry, SoNPV, Spilarctia obliqua.
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