Amongst various factors responsible for lowering down the yield of rapeseed-mustard, blight caused by Alternaria brassicae (Berk) Sacc. and Alternaria brassicicola (Schw.) Wiltshire is of greate importance. Blight symptoms appear as dark brown lesions with concentric rings in centre on leaves. Lesions on stem and pods are elongated and infected pods produce small, discoloured and shriveled seeds. Genotypes and fungicides play an important role in management of this disease. Plant extracts tested in present study inhibeted the fungal mycelial growth in between 48.90 to 77.80% at 10% concentration in invitro. In field condition disease was managed with the fungicides quntal @ 0.2%, a mixture of iprodione (25%) and carbendazim (25%) effectively.