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Downy Mildew in Bok Choy

How to identify and treat downy mildew in Bok Choy.

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Bok Choy care requirements

water
Keep soil evenly moist, providing 1–1.5 inches per week. Water consistently to prevent stress and bolting. Drip irrigation works well. Avoid waterlogging, which causes root issues.
soil
Rich, well-draining soil with pH 6.0–7.5. Incorporate 2–3 inches of compost or aged manure before planting. Bok choy appreciates fertile soil for optimal growth and tender leaves.
light
Full sun to partial shade; 6–8 hours of direct sunlight daily. Light afternoon shade in hot climates prevents bolting. Insufficient light slows growth and reduces vigor.
symptoms

Symptoms to look for in Bok Choy

  • fiber_manual_recordYellow patches on upper leaf surface
  • fiber_manual_recordGrey-purple fuzzy growth on undersides
  • fiber_manual_recordWilting
help

Common causes in Bok Choy

Caused by Peronospora and Pseudoperonospora species. Spreads in cool, humid conditions.

healing

How to treat downy mildew in Bok Choy

Remove affected material. Apply copper fungicide or phosphonate.

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Preventing downy mildew in Bok Choy

Avoid overcrowding. Water in morning. Choose resistant varieties.

Downy Mildew in Bok Choy — Symptoms & Treatment | GreenScout