Downy mildew diseases affect many different plants, including impatiens, rose and phlox.
Key Points:
- Downy mildew infected plants often have angular yellow leaf spotting on the upper surface of infected leaves. Infected leaves may become distorted and infected plants may defoliate.
- Downy mildew sporulation often appears on the underside of leaves.
- The disease rapidly spreads under cool, wet conditions.
