Hi there, I have 16 cedar trees in planters on my open patio. this is the 4th year I am having them, and they have been doing good in general. this year I noticed there are a large number of ants moving around the trees and their planters. At first I didnt bother, but now after a few months I found out that ants not only go inside the planters and dig into the planter soil, but also they are constantly crawling up an down the tree trunk and branches - and that the tress which are specifically targeted by ants are losing green/live leaves and stems. To the point that when i shake these trees which are more surrounded by ants, the tree loses a lots of leaves and small branches right away, covering the ground. I am now quite sure that the ants are harming my tress. :( what can I do to get rid of them?!