Is the stems damaged at all? Is there any discoloured or disformed legions on the stems? If so is there any ooze from the legions?
If so it may be 'Cypress canker' a fungus which is spread by wind-blown spores. The spores can also be spread by rain splash and birds and insects. The cambium tissue is attacked, leading to cankers or splits in the bark. Resin then oozes from the fissures.
If the tree is large enough it may be able to be treated by infecting a fungicide. Be careful with pruning hygiene, as secondary infection may be your biggest risk.
Hard to ID the tree from the pictures provided but my thought is it may be a 'Leyland cypress' X Cupressocyparis leylandii
Do you have any pictures or can you describe the cones on it? |