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 to act
Protect as humidity rises; prioritise ventilation and spacing.
What to look for
- Pale-yellow blotches on upper leaf surfaces
- Olive-green to brown fuzz underneath
- Leaf curling, drying and drop
- Reduced set in humid houses
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
Mildew Control — encapsulated adherent cover; pair with humidity management.
| Role | Product | Use |
|---|---|---|
| Primary control | Spore Control | Thymol; cover leaf undersides |
| Plant resilience | Armour Boost | Resilient tissue |
Product claims, rates, and availability vary by jurisdiction; always follow the applicable label.