One of our neighbors wrote the email below that is quite helpful:
I just contracted with Colorado TreeScapes, Inc. who will be removing 2 of my trees that are infected with the Ips Beetles and Turpentine Beetles. The cost is approximately $1,000.00 for 2 pretty good size trees, i.e. 25 to 30 feet. It is recommended that they be taken down quickly, ground up and removed, as well as spraying my remaining trees because the bugs are currently in flight. My trees went quickly. First sign of a problem was in May. You might want to post something on the website to just educate people about the problem and that it is beginning to sweep through our neighborhood. At the same time you might also want to educate everyone (via website & Nextdoor) that the board has no authority pursuant to our covenants to enforce removal of trees. They do become a fire hazard, however, and affect our property values, especially if we all start to lose our trees. Colorado TreeScapes is very reputable and might even cut a deal to the community if more people joined in the preventative measures. I have almost 35 mature pines and it will cost about $750.00 to spray them.
Other residents have found the following companies to be reputable:
Knothead Tree - Castle Rock- 303-885-3800
Colorado TreeScapes - Littleton - 303-770-4155
AAC Enterprises - Kiowa - 303-621-2469 (removal only)