Budding emerald ash
After the bomb cyclone we noticed a considerable amount of debris falling from our ash trees. Prior to this we did not notice budding of these trees and hard to believe we have this amount of debris left over from the fall. My questions are: Does this appear as though the ash trees had an early bloom? And if so, what impact will that freeze and loss of the blooms have on these trees. Is there anything you would recommend that we do on a preventative basis at this point. Also do you know if the emerald ash bore as any closer to the Denver area? We are actually in Greenwood Village . Do you recommend the ash bore treatment at this time for our area.
Arapahoe County Colorado
It is hard to tell from you photos, but I suspect that your debris is being caused by mites. Ash trees are susceptible to the ash flower gall mite. https://www.extension.iastate.edu/news/news/2006/jul/072801.htm
These are rarely harmful to ash trees.
If these photos don't look like your debris, that it could be the flowers of the ash, not the leaves.
Regardless, you shouldn't worry about your ash tree. We have had a good winter, and all of the landscape has received ample moisture for our vegetation.
As far as the Emerald Ash Borer, it has not been detected in Arapahoe county yet, therefore, we don't recommend any treatment yet. Here's some information on EAB.
If you have any further questions, let me know.