my lemon tree has a hole in the near bottom of the trunk,its not a deep hole and tree looks healthy,
Sounds like the plant might be affected by borers. Unfortunately, as yet we don't have a product that is registered to treat borers in trees. To reduce and prevent borer infestation, we recommend improving the health of the plant and try to prune the stems/branches that are infested where possible. You could also make a lance out of a metal coat hanger and lance the borers down the hole/s, however, this is a rather crude form of control. Arborists may also be able to further assist you with advanced trees as they may have access to products for chemical control.
Answered: 5 Nov, 2021