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Brown needles on leyland cypress

My leyland cypress are four years old and have been doing great. I live in zone 7 (North Carolina) and the rain fall has been normal this spring. They started out looking great this spring and all of a sudden the needles are turning brown and falling off on the inside of the trees. There is no bag worms showing and I can not see any other type of bugs on trees. Should I remove the brown needles or just leave them on tree? The trees are about 8 ft. tall. Any help will be appreciated.
Submitted by BHGPhotoContest

The pattern of browning on needles is suggestive of a needlecast fungal disease, but there is no common needlecast that affects Leyland cypress. It might be worthwhile to take a sample to your local cooperative Extension service for disease identification and diagnosis.

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