Proper diagnosis is important to know if you have ash borer or not.
I also get asked a lot about whether a tree should be sprayed to prevent ash borer.
That depends upon several factors. The first, from my viewpoint, is how likely are you to have an attack in your area and is your tree worth treating?
Take advantage of the spring snows and plant now….do by Arbor Day, April 27.
Arbor Day in Colorado is April 20.
National Arbor Day is April 27: https://www.arborday.org/celebrate/
Why Arbor Day? It is an important recognition of what trees and the natural world do to improve the quality of our lives each day: learn more
I ENCOURAGE YOU TO PLANT A TREE WITH YOUR SCHOOL, KIDS, OR COMMUNITY
I highly recommend you prepare to lose any ash trees that you have in your yard, especially if you are in the Boulder County area. Not only is the ash borer decimating the population across the country, the lilac borer is also attacking many ash as well: Communities across U.S. losing millions of ash each year
As long as the ground is not frozen, plant those trees you have been wanting, especially with this prolonged warm weather we are having. The nurseries have some great buys. They want to reduce their stock prior to the winter, since they are winding down for the season. Also, it is important to water (keep the soil moist) during these dry periods. The best way to preserve that moisture is to “mulch” with wood chips and the leaves you have raked up.