This leaf is showing symptoms of a fungal disease called large leaf spot (Monochaetia sp.) that affects oaks and chestnuts. The appropriately named spots may reach 2 inches wide and stretch across the entire leaf, killing large amounts of tissue. This disease is uncommon in South Carolina but has been documented to slow tree growth and reduce the size of annual growth rings. For more information, see this publication.
What Is It? Wednesday – Large Leaf Spot
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