Help - Dying Atlas Cedars
I have 4 blue atlas cedars in my yard - watered but well drained. One has suddenly dropped all its needles and died. Two others (not the weeping variety, as far as I know) are suddenly drooping, with their bark beginning to peel away on the trunks. One healthy cedar remains.
On one of the two dying cedars, I found a half dozen beetles (pic of one attached) underneath a piece of the shedding bark.
I am a complete tree novice, and could use any ideas:
(1) Is this beetle a form of pine bark beetle? Or does it look like a benign insect not likely to harm the trees?
(2) If this beetle is the cause of the demise of my first cedar, is there anything I can do to save the two dying and one healthy tree.
(3) If this beetle is not likely the cause of the cedar's demise, any other suggestions for what might have killed the cedar so suddenly? I will post a pic of the dead tree in a follow up.