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Old 09-13-2012, 11:36 AM
macgyver_GA macgyver_GA is offline
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Join Date: May 2010
Location: Canton, GA
Posts: 815
Looks like Helminthosporium fungus

http://www.caes.uga.edu/publications/pubDetail.cfm?pk_id=6072#Diseases

I noticed two of these spots in my yard the other day. I think the cool dry week, followed by high humidity all last week, then a quick snap back to low humidity and cool temps on Sunday made conditions favorable.
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