Common crops affected
Why it matters
It reduces photosynthesis and can defoliate a protected crop; high humidity drives it, so ventilation plus protection is the reliable combination.
When it appears
High humidity and still air, especially in protected culture.
How to identify it
- Pale yellow blotches on the upper leaf surface
- Olive-green to brown velvety fuzz on the underside
- Yellowing, curling, and leaf drop in humidity
How to manage it
- Increase ventilation and lower humidity; avoid wet foliage.
- Remove infected leaves.
- Apply Spore Control (1:1,000) covering leaf undersides.
Recommended Vegalab program
| Role | Product | Use |
|---|---|---|
| Primary control | Spore Control | Thymol; cover leaf undersides |
| Plant resilience | Armour Boost | Resilient tissue |
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