Common crops affected
Why it matters
It spreads explosively when leaves stay wet, causing severe defoliation and yield loss; prevention ahead of wet weather is essential.
When it appears
Cool, wet, humid conditions and prolonged leaf wetness.
How to identify it
- Pale yellow angular patches on the upper leaf surface
- Fuzzy growth on the underside beneath the patches
- Rapid spread in cool, wet weather
How to manage it
- Improve airflow; avoid overhead watering; water early.
- Remove infected leaves.
- Apply Spore Control (1:1,000) at first sign and ahead of wet weather.
Recommended Vegalab program
| Role | Product | Use |
|---|---|---|
| Primary control | Spore Control | Thymol protective fungicide |
| Companion | Mildew Control | Where mildews dominate |
| Plant resilience | Armour Boost | Resilient tissue |
Product claims, rates, and availability vary by jurisdiction; always follow the applicable label.