Branch Die-off and Thinner Leaves on Sweet Gum TreeI have two sweet gum trees in my yard about 75 feet apart. This past year, the leaves have not been as dense, and one of the trees had 4-5 large branches die off. I had them removed, and some of the inner wood was blackened. No insect tunnels were noted. This tree is in a rather wet part of the yard except in July-August when we have very hot dry weather. The other is well drained with no limb loss. One non-arborist tree guy suggested carpenter ants, but there is no wood damage or saw dust. What is happening to my trees and what can I do about it? Thanks!