| Yellow & brown ring on Den leaf
The discloration started about three days ago. The ring was a light green like Photo 3 and then deepened to brown in the center along with yellowing. The photos were taken Tuesday morning and by evening the color had gotten more intense.
As you can see, the top right leaf is starting to show the same problem. Last Thursday it got some sun exposure for twenty minutes. I don't think this is sunburn though.
What is this and what can I do?
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