“…In the recent years, twister disease of onion is assuming an epidemic proportion in major onion growing areas especially the west coast of southern India causing heavy yield loss (Hegde et al, 2012;Nargund et al, 2013). The onion disease with similar kind of symptoms are first reported from Zaria, north Nigeria, in 1969 with 50-100 per cent estimated severity (Ebenebe, 1980) and later during 1970 in Sri Lanka (Kuruppu, 1999). In India, the disease was first reported by Sinha and Singh (1994).…”