yellow green mold killing trees in carroll county md

Asked April 2, 2018, 9:52 AM EDT

mold attacked ash trees and killed them, now spreading to other trees, including cheroke dogwood and blue spruce

Carroll County Maryland lichen ash tree

3 Responses

This looks like lichen on your tree trunk and there are many types. They may grow on mature trees and are not a reason for decline. They are considered a good indicator of air quality. Leave them be.
http://extension.umd.edu/hgic/lichens-trees-and-shrubs
http://extension.umd.edu/learn/i%E2%80%99m-lichen-it-peak-season-lichen-peeping

Your ash tree may have declined due to the emerald ash borer, an invasive pest. See our website for more information http://extension.umd.edu/hgic/invasives/emerald-ash-borer

mh

Good to know