cedar foliage with "oily" markings

Asked November 5, 2019, 1:02 PM EST

I have recently noticed bluish black patches on the leaves of my 5 year old cedar. It does not scrape off nor does appear to be causing damage. The tree is healthy with no signs of stress. From manitoba canada. Thank you

Outside United States trees and shrubs

1 Response

Thank you for your question. It is near impossible to diagnose a plant problem without a clear, up close photo, as well as one of the entire tree (to see if it is an isolated issue, or a more widely based one. You can reply with such photos, or contact your province's Master Gardeners, who might be better acquainted with your area's issues. Here is their webpage: https://www.mgmanitoba.com/contacts/

Good luck!