Leylandii problem

Question

Please see attached image of part of my hedge. It’s Leylandii, very mature. It started doing this late last year. What’s the best approach?

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Answer 1

It sounds like blight. Here are common problems with Leylandii cypress:

https://www.gardeningknowhow.com/ornamental/trees/leyland-cypress/leyland-cypress-diseases.htm