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How to Manage Pests

The UC Guide to Healthy Lawns

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Diagnosing problems on Kentucky bluegrass in spring

From "leaves with distinct spots"

What are your symptoms?

Black spikey fruiting structures on leaves Leaves with hourglass-shaped band Leaves with elongated brown spots Leaves with orange pustules
Leaves with reddish-brown to tan lesions; black, spikey fruiting structures present Leaves with 2 reddish bands across leaf in an hourglass shape; cobwebby threads may be seen Leaves with circular or elongated brown spots with brown centers and dark bands 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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