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This article is a list of diseases of mustard (Brassica juncea var. crispifolia and B. nigra).

Bacterial diseases

Bacterial diseases
Bacterial black rot	Xanthomonas campestris pv. campestris
Bacterial soft rot	Erwinia carotovora Pseudomonas marginalis pv. marginalis
Xanthomonas leaf spot	Xanthomonas campestris pv. armoraciae

Fungal diseases
Alternaria black spot	Alternaria brassicae Alternaria brassicicola Alternaria raphani
Anthracnose	Colletotrichum gloeosporioides Glomerella cingulata [teleomorph] Colletotrichum higginsianum
Black leg (leaf, root and stem rot)	Leptosphaeria maculans Phoma lingam [anamorph]
Black root	Aphanomyces raphani
Cercospora leaf spot	Cercospora brassicicola
Clubroot	Plasmodiophora brassicae
Damping-off	Fusarium spp. Rhizoctonia solani Thanatephorus cucumeris [teleomorph]
Downy mildew	Peronospora parasitica
Head rot	Rhizoctonia solani
Leaf spot	Myrothecium roridum Phyllosticta brassicae = Phyllosticta brassicina
Powdery mildew	Erysiphe polygoni
Sclerotinia stem rot	Sclerotinia sclerotiorum
Southern blight	Sclerotium rolfsii Athelia rolfsii [teleomorph]
White rust	Albugo candida (Peronospora sp. commonly present in staghead phase)
White leaf spot	Pseudocercosporella capsellae
Wirestem	Rhizoctonia solani
Yellows	Fusarium oxysporum

Miscellaneous diseases and disorders
Autogenic necrosis	Genetic disorder

Nematodes, parasitic
Root-knot	Meloidogyne spp.

Viral diseases
Mosaic	Cauliflower mosaic virus
Rai mosaic virus	Turnip yellow mosaic virus