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Turf Rusts—Puccinia spp.

Many rust fungi infect lawn grasses. They appear in late summer to early fall when the weather is dry and generally on lawns and other turf areas growing very slowly. When grass becomes infected by rust fungi, it is more susceptible to attack by other pathogens.

symptoms of rusty turf close up of powdery substance produced by rusty turf close up of spores
Infected areas of lawn take on a generally yellow to orange appearance. Rusts produce a reddish, yellowish or orange powdery substance on the grass. The powder is actually millions of microscopic spores produced by a fungus.

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[Photos: University of Minnesota Extension]

It is the policy of the State of Maine to minimize reliance on pesticides. The Maine Department of Agriculture and the Maine IPM Council encourage everyone to practice integrated pest management and to use pesticides only as a last resort. The mention of pesticides in the fact sheets linked to these pages does not imply an endorsement of any product. Be sure that any product used is currently registered and follow all label directions.