Injured or damaged trees
Severe twisting and breakage at ground level
This type of injury is likely to be fatal. However, if some of the main trunk remains intact there is a chance the trees will reshoot if you make a clean cut below the damaged area. If this is below the graft it will result in the loss of the variety, taking the tree back to the seedling stock. This isn't an issue in seedling trees such as rollinia or soursop, or in marcotted trees such as lychee or longan. But in trees with specific varieties, such as avocado, durian, jackfruit or rambutan, the rootstock that is left is unlikely to be worth saving.
Paint the upper side and the end of the stump with a 1:4:20 mix of water-based, white acrylic paint, micro fine lime and water (i.e. 1L paint, 4kg lime and 20L water), and some fungicide, to help prevent sunburn and wood rot.
Broken main trunk or broken primary and secondary limbs
This damage will affect the shape as well as the general health of the tree. Consider:
- pruning the tree properly to avoid additional damage
- making a clean cut behind the damaged and splintered wood (ensure a downward-facing cut so that that moisture does not pool on the cut)
- painting the stump, pruning cuts and exposed branches with with 1:4:20 mix of water-based, white acrylic paint, micro fine lime and water, and some fungicide, to help prevent sunburn and wood rot.
If branches are split at the crotches, but are worth saving, pull them back into place and secure them.