🥬 Cabbage How hard it is to control: ★★★★★ 5/5

Clubroot on cabbage

Soil-borne disease caused by a fungal-like organism (Plasmodiophorida). Can survive in soil for over 20 years. Particularly dangerous in acidic soils.

Symptom photos

Clubroot — Badly distorted root system — club-shaped swellings and galls — Badly distorted root system — club-shaped swellings and galls Photo: Leafhopper65, licence Public domain

Clubroot — Roots in the soil — white, knobbly galls instead of lateral roots — Roots in the soil — white, knobbly galls instead of lateral roots Photo: Rasbak, licence CC BY-SA 3.0

Clubroot — Whole plant — poorly developed root ball with galls — Whole plant — poorly developed root ball with galls Photo: Rasbak, licence CC BY-SA 3.0

Symptoms

Deformed roots
Gall-like swellings
Leaf yellowing
Wilting on hot days

What it does to the crop

Complete crop failure with severe infection
Soil infection for many years
Impossibility of growing brassicas in this location

What encourages it

Acidic soil (pH < 6.5)
Excessive moisture
Brassica monoculture

Prevention

Liming soil to pH 7.0-7.5
Minimum 7-year break in brassica cultivation
Resistant varieties
Tool disinfection

⚠️ Before you reach for a spray

This atlas is informational and still growing — different diseases can look almost identical. Confirm the diagnosis and read the product label before applying any plant protection product. If you are unsure, ask your local extension or advisory service.

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