Sick ash trees
In the Hillmeade Station development (Hillmeade Rd & Hillmeade Station Dr) and on Glenn Station Ct, both in Glenn Dale, MD, there are lots of what I think are a species of Ash tree. They all have lots of dead branches and some are very sickly. Most of the dead branches are high up, but I think I can see D-shaped holes on them.
The emerald ash borer has been found in your county. You will have to identify the trees to make sure they are ash trees.
Begin by looking at the emerald ash borer information on our website .http://extension.umd.edu/hgic/invasives/emerald-ash-borer
If county property or commercial notify them for the best way to proceed. If they are on your property you should contact a certified arborist for an onsite diagnosis regarding the health of the tree. You may have to consider removal or treat the tree. Consult the North Central IPM Center's fact sheet Insecticide Options for Protecting Ash Trees From Emerald Ash Borer as well as a decision guide by Purdue. Large specimen trees will need to be treated by a certified arborist. http://www.treesaregood.org/
There are homeowners options for treatment but the trees have to be within a certain size ( this is DBH - Diameter at Breast Height).
If the tree is removed, the wood chips can be used as mulch, put into your compost pile or sent to the dump. Emerald ash borer cannot exist in the chips. The best thing to do is to use the chips right on your property.