Emerald ash borer (EAB) There are no arborists in Delta County certified to perform injection treatments at this time.
Colorado State Forest Service. https://csfs.colostate.edu/forest-management/emerald-ash-borer/
PlantTalk – Colorado. https://planttalk.colostate.edu/topics/insects-diseases/emerald-ash-borer-colorado-1499c/
Emerald Ash Borer Network http://www.emeraldashborer.info
U.S. DEPARTMENT OF AGRICULTURE. HTTPS://WWW.APHIS.USDA.GOV/APHIS/OURFOCUS/PLANTHEALTH/PLANT-PEST-AND-DISEASE-PROGRAMS/PESTS-AND-DISEASES/EMERALD-ASH-BORER
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Taking proper care of trees includes not overwatering, not over fertilizing, pruning, dealing with problems like iron chlorosis yellowing, and many other conditions. Here are some links to guide you with tree care.
CSU Garden Notes Care of Recently Planted Trees
Herbicide Use Around the Landscape
Preventing Construction Damage
Dealing With Leaves in the Landscape
Seasonal Tree Care For Boulder, but useful here
Sick Tree Day is an opportunity to have experienced eyes look at tree problems. You can also submit questions and samples to the TriRivers Extension 0ffice in Delta by email, by phone, or in person. For $25 the CSU Master Gardener diagnostic group will make a site visit to look at problems. Call Tri-Rivers extension service office in Delta.