Common crops affected
Why it matters
Bottom-up defoliation cuts photosynthesis and exposes fruit to sunscald and tubers to infection, lowering yield and quality; it returns from soil and debris each season.
When it appears
Warm, humid weather; starts on older lower leaves.
How to identify it
- Dark spots with concentric rings (target/bullseye look)
- Yellowing around spots on the lowest, oldest leaves
- Defoliation progressing up the plant
How to manage it
- Mulch to reduce soil splash; stake and space for airflow.
- Remove infected lower leaves and debris.
- Apply Spore Control (1:1,000) at first sign and through warm humid spells.
Recommended Vegalab program
| Role | Product | Use |
|---|---|---|
| Primary control | Spore Control | Thymol protective fungicide |
| Plant resilience | Armour Boost | Resilient tissue |
Product claims, rates, and availability vary by jurisdiction; always follow the applicable label.