Black Spot on Knockout Roses – Marketing vs. Reality

Black Spot on Knockout Roses – Marketing vs. Reality

Knockouts have some resistance, not immunity. They still get black spot, especially in wet years.

Why Spray Anyway

• Vigor masks symptoms initially.
• Unchecked, black spot reduces vigor over time.
• Spraying preserves the plant's health and bloom power.

Action

Use rose fungicide for black spot. Don't believe "no-spray" hype – it's marketing, not biology.