Treat the Wounds to Your Trees
Regardless of the cause of injury, all wounds should be treated the same. Do not use pruning paint! Tar and heavy coatings of asphalt all tend to seal in decay and prevent or inhibit the production of callous tissue around the wound site. Generally, all that is needed is for loose and damaged bark to be carefully scribed into rounded shapes which are more easily compartmentalized by wounded trees. Keep mowers and string-line trimmers away from trees and try to prevent wounds that lead to rot.