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Tommy Cowett on the lawn with Growingreen discovers a deadly disease of Leyland Cypress. Seridium canker is the most deadly disease of the tree exhibited by sap oozing small black dots on the stems are the fruiting bodies. Needles will typically fall of when touched. A second canker disease of leylands is Bot canker caused by the fungus botrysphaeria dothidia. It is also deadly but does not tend to kill as rapidly. It can not be cured with traditional fungicides but may be managed through pruning of dead material, clean cultural practices and lots of TLC.