Disease
Powdery mildew
Powdery mildew creates a white, dusty coating on leaves and spreads more easily where airflow is poor.
How to confirm it
- Look for a dusty white coating on leaf surfaces.
- Check whether crowded growth is limiting airflow.
- Remove a leaf and compare symptoms across several plants.
Next Steps
Fixes connected to this cause
Improve airflow
Crowded growth traps humidity and makes some fungal and pest problems harder to manage.
Protect plants with netting
Netting helps reduce some pest pressure and physical damage when used with proper support.
Spray neem oil
Neem oil can help with mild powdery mildew or aphid pressure, but it works best after airflow and spacing are already fixed, not instead of fixing them.