Aug 14, 2013 - 02:49 PM
Edward, the best single product to use is the KM Ant Pro System. Given time, this system will replace the ants natural food sources which are aphids, insects, plant juices, etc. The Ant Pro dispensers are placed next to the tree and around it.
The benefit of using this baiting system is that it will take care of ants that are indoors, and also ants that are outdoors. The ants that are indoors must go outdoors for food. They do not eat wood. They only excavate the wood to nest in it.
Outdoors, the Ant Pro System will kill ants that are foraging for food sources. It will also intercept invading ants from other far away nests or colonies.
If you want to spray the tree, use Merit 75. This product will not hurt the tree, is non-repellent and will kill the existing ants. It will not provide much protection against invading ants.
After all there is hope for carpenter ants in trees.