Ash borer disease is caused by the metallic green Emerald Ash Borer Beetle, a quite recent but utterly unwelcome arrival in Colorado. Apart from the active creatures themselves, you might also spot creamy-colored larvae, each just about the size of a single grain of rice.
An inspection of your ash tree could reveal other possible symptoms such as dead branches and sparse leaf coverage at higher levels in the canopy. There might also be excessive sprouting around the base and lower trunk areas.
If you like birds, you might welcome the appearance of some woodpeckers in your garden. However, they could be feasting on the larvae!
To find out more about recognizing and treating this fast-spreading disease, contact A Touch of Class tree service here in Denver.