Knowledgebase

hemlock infestation? #779324

Asked December 21, 2021, 9:50 AM EST

Dear Master Gardener, My weeping hemlock has this bluish scale on its stems, where it is losing needles. Can you tell me what it is and what, if anything, I can do about it? The plant is generally stressed, so this may not be the only problem. Thanks, Ann Hubbard

Hamilton County Ohio

Expert Response

That is lichen and harmless to the tree. It is not a disease.  See the link below for more info.

https://ohioline.osu.edu/factsheet/plpath-gen-12

Catherine Freay Replied December 27, 2021, 9:53 AM EST

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