Category Archives: Cabbage/Kale Diseases

(Plasmodiophora brassicae) Credits:Biovision-Infonet Clubroot caused by the slime mould fungus Plasmodiophora brassicae is particularly serious in Malawi. Its distinctive symptom is an abnormal enlargement of roots or even the underground stem. Its development is favoured by wet, cool, acidic soils. What to do: Practise crop rotation. Irrigate properly. Adjust pH to 7.2 with hydrated lime

(Alternaria brassicae) Credits:Biovision-Infonet Alternaria leaf spot or black spot is caused by the fungus Alternaria brassicae. The disease can severely damage cabbage if uncontrolled. The initial symptoms are small, circular, dark spots on older leaf surfaces. As the spots enlarge, concentric rings develop within lesions surrounded by a yellow halo. The tan-coloured centres of lesions may […]

(Albugo candida) Credits:Biovision-Infonet It affects every known cruciferous crop. However, this disease is generally less common on cabbage, Brussels sprouts, broccoli and cauliflower than on radish, horseradish, mustard and turnip. Leaves have chlorotic or necrotic spots on their upper surface. Pustules form on the lower side of the leaves, small stems and floral parts. What […]

(Xanthomonas campestris pv. campestris) Credits:Biovision-Infonet Black rot is caused by the bacterium Xanthomonas campestris pv. campestris, and is one of the most serious cabbage diseases in warm climates. The black rot bacterium can over-season on infected cabbage seeds, in weeds from the family Cruciferae (including: black mustard, field mustard, wild turnip, wild radish, shepherd’s purse, and pepperweed); or in infected […]