We have a similar problem with bark beetles in pinyon pine trees in the southwest. The theory I heard is that when winters don't get cold enough, too few of the

We have a similar problem with bark beetles in pinyon pine trees in the southwest. The theory I heard is that when winters don't get cold enough, too few of the beetles die off, and many pinyons can't handle the additional parasite load. The trees die and huge swaths of forest burn up.