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Brown spotted and brown leaves on Holly Tree





I recently planted 2 grown Nellie Stevens Holly trees at the beginning of winter when we had a warm spell 3 weeks ago. I live in Zone 6, clay soil. I noticed the leaves have turned lighter with brown spots, and some are dark brown. One of the trees shows signs of dieback. The branches are brittle, no green when I scratch them. We recently went through a winter freeze, with temperatures between 22-14 F. How can I help my hollies? I’m not sure what is happening to them or how to save them. Any help is appreciated! 0
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I'd agree with @BobTheGardener - it looks like a fungal infection -sooty mould or something similar.
I live in west central Scotland - not where that photo is...