Answer: Based upon your gardening region and the description of the problem, I'd venture your lawn has Pink Snow Mold, also called Fusarium Patch. This fungal disease occurs in spring and fall and is very common in western Washington. The fungus lives in soil and on diseased grass, infecting the grass during cool, wet weather. It begins with reddish-brown circular patches and progresses to white or pinkish masses. To avoid, do not overfertilize, mow and remove grass clippings until grass growth ceases in the fall, and try to promote good air circulation and soil drainage. If these cultural measures do not control the problem, you can apply a fungicide to your lawn.
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