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Mystery tree damage
I've a Salix Cinerea, on which this has appeared at the base; it's about 2cm across.
Any ideas on the culprit? Aside from the many birds, we have a frequent grey squirrel; a mouse or rat is also possible. I am assuming it's the squirrel.
It's our only tree, so I'd appreciate tips on what to do with the wound (if anything).

Any ideas on the culprit? Aside from the many birds, we have a frequent grey squirrel; a mouse or rat is also possible. I am assuming it's the squirrel.
It's our only tree, so I'd appreciate tips on what to do with the wound (if anything).

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Step 1: Pare the rough edges away with a sharp knife.
Step 2: Cover the area with a 4cm deep layer of damp moss.
Step 3: Wrap with polythene and hold in place with waterproof adhesive tape. The polythene should be wide enough to completely cover the area and prevent the moss drying out.
Step 4: Leave the patch in place until the end of the growing season i.e. at least three to four months to allow the damaged to heal.
Step 5: Check the ties periodically to ensure there is no serious constriction to the trunk and loosened if necessary.
Step 6: Ensure adequate soil moisture by watering during hot, dry periods in spring and summer.
I would also put a tube of chicken wire round the stems of susceptible trees and shrubs to keep the squirrels off.
If the wound was larger then I'd definitely have gone out for foam.