Thanks to the astute observations of some local friends, and the rapid-fire Googling skills of other friends, we found a mystery and solved it in a matter of minutes. It turns out the the mystery objects spotted in local trees are traps for the Emerald Ash Borer, a ferocious tree mutilating insect from Asia which has escaped quarantine. Read more in the links below.
Anacostia Watershed Society
U. Maryland - Home and garden info center
