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Wet Spring Leading to Brown Spots on Oaks and Maples

Anthracnose
University of Minnesota Extension

ST. CLOUD — You may be noticing some brown, blotchy spots on your oak trees or maple trees. But, a horticulturist with the University of Minnesota Extension Office says there’s no need to be concerned.

Beth Berlin says we’re seeing a fungi commonly called anthracnose appear on our leaves. She says it’s common during cool, wet springs like we’ve been experiencing this year. But, Berlin says it’s very unlikely your trees will be harmed.  She says generally the trees can withstand the fungi growth without much damage.

Berlin says if the fungi appeared during bud growth, you may see your trees dropping leaves, but she says they may show re-growth afterward.

There isn’t much you can do to manage the anthracnose either. Berlin says warmer, drier weather is the best cure.

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