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

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How to Manage Pests

The UC Guide to Healthy Lawns

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Diagnosing problems on perennial ryegrass in summer

From "feeding on stems, crowns, roots, or leaves"

What are your symptoms?

Lifting up turf Curled up caterpillar Lifting up turf to expose C-shaped grubs
Grass is thin and dying; feeding damage present on crown, stems, and roots and whitish frass may be seen; turf is easy to pull up but does not roll back; presence of whitish legless grubs Feeding damage present around crown; leaves are chewed and cut around the crown; presence of caterpillars that curl up when disturbed Lawn feels spongy; feeding damage on roots; turf can be easily rolled back like a carpet; presence of white, C-shaped grubs with legs

None of these symptoms

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