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 to act
Protect preventively once regional risk begins and before leaf-wetness events.
What to look for
- Angular yellow lesions bounded by leaf veins
- Gray-purple sporulation on undersides
- Rapid browning and collapse of leaves
- Sudden defoliation and exposed fruit
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
Mildew Control — encapsulated, adherent cover that resists wash-off for rainfast protection.
| 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.