A field experiment was conducted during 1992-1994 to evaluate the effect of different dates of sowing on incidence and severity of the major diseases of rapeseed-mustard (Brassica compastris, var. toria) under rainfed condition of Nawalpur, Sarlahi. A toria variety 'Vikas' was sown in 10 different dates starting from Sept. 5 to Dec. 5 at 10 day intervals. The mustard sown on 25 Sept. and 5 Oct. showed low severity (13-22%) of Alternaria blight (Alternaria brassicae), complete escape of downy mildew (Peronospora parasitica) and powdery mildew, (Erysiphe cruciferarum) and partial escape of white rust (Albugo candida). Seed yields 703 and 804 kg/ha obtained form those two dates were found significantly higher than those obtained from other seeding dates. Incidences and severities of diseases increased gradually in successive sowing dates.

A field experiment was conducted during 1992-1994 to evaluate the effect of different dates of sowing on incidence and severity of the major diseases of rapeseed-mustard (Brassica compastris, var. toria) under rainfed condition of Nawalpur, Sarlahi. A toria variety 'Vikas' was sown in 10 different dates starting from Sept. 5 to Dec. 5 at 10 day intervals. The mustard sown on 25 Sept. and 5 Oct. showed low severity (13-22%) of Alternaria blight (Alternaria brassicae), complete escape of downy mildew (Peronospora parasitica) and powdery mildew, (Erysiphe cruciferarum) and partial escape of white rust (Albugo candida). Seed yields 703 and 804 kg/ha obtained form those two dates were found significantly higher than those obtained from other seeding dates. Incidences and severities of diseases increased gradually in successive sowing dates.