For ants, treat individual mounds with an insecticide. Sprinkle Orthene powder on the mound or drench it with another insecticide. To drench, get a bucket and mix several gallons of solution. Slowly pour one to two gallons on each mound. Treat again, using more liquid if this does not kill them.
Many trees have holes in their leaves now or leaf spots.
I expect this in the fall. Most are too large to spray. Try to ignore them. Many times the pest is long gone, and we are only seeing the calling card they left. If you catch an insect, and there are lots of them and the tree is small, perhaps then we can treat them.