Bark Beetles in the Neighborhood

The following comment was received from our bulletin contact form.  Your comments are invited...

"My beautiful 60-70 foot Scotch pine tree got infested with bark beetles this Spring, believed to be some mountain and some possibly red turpentine.  Just another heads up to folks in the hood that you can lose an iconic, invaluable piece of your property in a matter of months if you are not careful to treat your trees.  I wanted to treat the trees in our easement, but I heard my neighbor stopped to people I hired from doing so while I was at work because they don't like chemicals.  I checked the MSDS (material safety data sheet) for the chemicals used to ensure minimal exposure, but it is likely that if people want zero chemicals applied, we will have zero trees. I was told that once one tree is infested, there's a much greater chance that all other adjacent trees will be at much higher risk.   I work for the Environmental Protection Agency (EPA) and have spent my career as an environmental engineer, and I understand very clearly trade offs necessary for using responsible or green chemicals to treat infestations. Perhaps an article and some suggested arborists or products would be helpful to our neighbors?"