Q What are these black marks on my wal­nut fruits and leaves?

Garden Answers (UK) - - Problems Solved - Jill lampier, by email

A Dark marks on the fruits can be caused by phys­i­cal dam­age, such as heavy winds. The most com­mon cause of leaf de­for­mity is leaf gall, which causes raised lumps on the leaf un­der­sides. There’s also an an­thrac­nose dis­ease that causes black marks on the leaves but it rarely af­fects the fruits. What’s more, it’s most com­mon in wet weather, so it’s un­likely to be a prob­lem this sum­mer!

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