Symptoms
- check_circleWhite or grey powdery coating on leaf surfaces
- check_circleAffected leaves yellowing and curling
- check_circleDistorted or stunted new growth
- check_circlePowdery patches on stems and flower buds
Causes
- arrow_rightHigh humidity combined with poor air circulation
- arrow_rightOvercrowded planting conditions
- arrow_rightWarm days and cool nights
- arrow_rightExcessive nitrogen fertilisation promoting soft growth
- arrow_rightWater-stressed plants are more susceptible
How to Diagnose
The white powdery coating is distinctive — unlike downy mildew, powdery mildew sits on the upper surface of leaves and can be rubbed off with a finger.
Treatment
Remove and dispose of affected leaves. Spray with a diluted solution of baking soda (1 tsp per litre of water) or neem oil. Ensure good air circulation around the plant. In severe cases, use a fungicide labelled for powdery mildew.
Prevention
Space plants adequately for air flow. Avoid overhead watering. Do not over-fertilise with nitrogen. Water in the morning so foliage dries before evening.
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