The conditions for Lichen to thrive. Damp cool conditions and possibly lack of light. Can also thrive on slow growing shrubs/trees. I've seen them on many aged roses in open areas. If you don't want Lichen to thrive, you need to look into the cause. Branches may need pruning out, the growth may be weak and poor. But as mentioned, it doesn't damage the bark. It's sitting on the top surface and can be cleaned off carefully.
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Can anyone help?
Looks like some form of lichen. Unlikely to do any direct damage to the tree. It must like the growing conditions.
The conditions for Lichen to thrive. Damp cool conditions and possibly lack of light. Can also thrive on slow growing shrubs/trees. I've seen them on many aged roses in open areas. If you don't want Lichen to thrive, you need to look into the cause. Branches may need pruning out, the growth may be weak and poor. But as mentioned, it doesn't damage the bark. It's sitting on the top surface and can be cleaned off carefully.
Last edited: 17 January 2018 22:27:17
Thank you very much for letting me know ?
Lichens can take many years to grow and normally signify a good , clean and healthy environment .
Why would anyone want to remove them ?
Of no detriment to the plant whatsoever .