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Disease affecting Leyland Cypress trees

Bay Area Gardener
11 years ago


I have a row of Leyland Cypress trees here in the suburbs of Seattle. This year after a very wet and cool spring I noticed that some needles on most of the trees in the row have started turning yellow and brown. In addition there are sections on the trunk where sap is oozing out. Please see the pictures at the bottom of the post for an illustration. As an additional data point I went through the row of trees earlier in the year and pruned them with a shearer - could this have caused any disease to enter the tree?

Is this a disease affecting the trees? If so should I be worried and can I do anything to get rid of it? Thanks in advance!

Tree bleeding sap:


A closeup of a sap filled blister on the branch:


Picture of the needles on a tree:


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