Cabbage diseases

Every guide

• Alternaria Leaf Spot High Fungal Small black specks first, enlarging into dark brown to black circular spots. Target-like concentric rings within spots, surrounded by a yellow halo
• Bacterial Leaf Spot / Soft Rot High Bacterial Leaf spot: small dark brown to purple leaf spots that merge into angular lesions. Leaf spot: ragged, torn-looking foliage; severe infection kills leaves
• Black Rot High Bacterial Yellow, V-shaped lesions starting at the leaf margins and pointing inward. Blackened veins within and around the lesions (a diagnostic sign)
• Cabbage Aphid High Pest Dense colonies of small grey-green aphids with a powdery, dusty wax coating. Colonies on new growth, leaf undersides, and inside the developing head
• Downy Mildew High Fungal Small, angular, pale green to yellow lesions on the upper leaf surface, often bounded by veins. White to grey downy (fuzzy) mould on the underside directly below the…
• Ring Spot Medium Fungal Circular brown-grey to black spots (up to 20 mm) with lighter centres. Black fruiting bodies arranged in concentric rings inside the spots (visible as black dots)
• Healthy Cabbage Low Healthy plant Firm, blue-green leaves with no spots, lesions, or yellowing. No V-shaped marginal lesions or blackened veins