Incidence of rice stem nematode, Ditylenchus angustus in relation to sowing time of deep water rice in Assam

A field experiment was conducted in kharif season of 1990 and 1991 at Regional Agricultural Research Station. Assam Agricultural University, North Lakhimpur, Assam to evaluate the incidence of rice stem nematode, Ditylenchus angustus which causes ufra disease in deep water rice in relation to different dates of sowing commencing frorn March, 6 onwards upto May, 5 with 15 days interval. Results I evealed that maximum incidence of ufra disease was observed in March. 6 sowing (100 per cent) but gradually declined as the sowing was delayed upto May. 5 (37.20 per cent) which showed minimum disease incidence.