The field surveys conducted in northern India revealed the existence of three major biotic mortality agents, viz., nuclear polyhedrosis virus, a braconid parasitoid, Apanteles obliquae Wilkinson and tachinid larval-pupal parasitoid, Carcelia sp., of Spilosoma obliqua. Of these, the NPV was the most important mortality factor contributing 39.3 to 84.0 per cent to the total mortality of the pest. NPV, disease coexisted with A. obliquae as well as Carcelia sp. and provided substantial contribution in natural suppression of S. obliqua. none