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Home & Garden > Lawn Guide > Manage Pests > Diagnostic Key > Perennial Ryegrass, Winter

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How to Manage Pests

The UC Guide to Healthy Lawns

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Diagnosing problems on perennial ryegrass in winter

From "grayish white powdery growth or reddish-orange pustules"

What are your symptoms?

Powdery growth on leaves Leaves with orange pustules
Grayish-white growth; leaf blades turn yellow Leaves with small yellow spots and orange or red pustules

None of these symptoms

Statewide IPM Program, Agriculture and Natural Resources, University of California
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