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Eyespot Gall (caused by the midge Acericeris ocelliaris)

Steven Katovich, USDA Forest Service, Bugwood.org
This looks like a fungal disease but is actually damage done by the midge - a small fly-like insect, Acericeris ocellaris. The midge causes a raised area on the leaf where the insect larva feeds - It produces a hormone that causes the bright red and yellow rings around the original egg damage. A disease causes similar spotting, but there will not be a raised area present.
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