Hello. I have an ash tree that overproduced seeds last year. Now after this freeze, all of the leaves have fallen off. Is this a sign of under watering the tree? Do I need to get it removed?
Jefferson County Colorado
Hard to say. It is very possible that stress of some sort was behind the tree's excessive seed production; the stress could have been related to disease, water, or insect activity.
While Emerald Ash Borer (EAB) has not been discovered in Jefferson County, it has been seen in Broomfield. For up-to-date information on EAB, I would suggest looking at this webpage: https://www.colorado.gov/pacific/agplants/emerald-ash-borer
Regarding tree removal, I would direct you to this Emerald Ash Borer decision guide: https://csfs.colostate.edu/media/sites/22/2015/10/FINAL-Managing-EmeraldAshBorer-DecisionGuide.pdf
If you decide to keep the tree, it may be helpful to provide it with fall and winter water: https://extension.colostate.edu/docs/pubs/garden/07211.pdf
Lastly, if you decide to have an arborist conduct a site visit, I would recommend using the following link to help you find an ISA International Society of Arboriculture) certified arborist near you (search by location): https://www.treesaregood.org/findanarborist/findanarborist .