DrCloud, on 12 August 2010 - 08:11 AM, said:
Yep. When we bought our house (at the beginning of 2008), there were barely hints on the east side, and the Realtors and other boosters were downplaying the possibility of the bugs' getting over the Divide. Having seen their progression in Grand County (and how they had marched right over Berthoud Pass even then), we knew better. The next couple of years are going to be tragic. HPH
Agreed! The lodgepole pine forests are definitely in great danger of 95% death. It's unclear how seriously the Ponderosa Pines will be impacted. Most property owners are using pine bark beetle deterrents in an effort to save the Ponderosa pines. (The lodgepoles have been mostly written off.) There are two. Spraying with a residual insecticide is most common. The spraying is done in late May to early June and is supposed to last 100 days. That covers the time of beetle flight, as they spread with the wind from tree to tree. The insecticide is a blunt tool and does take out other insects. Not very bird friendly. About $13 per tree cost.
The second deterrent is the use of pheromone packets. Evidently, the pine bark beetle emits a pheromone after it infests a tree. That pheromone tells other pine bark beetles the tree has been taken and they should go elsewhere. Someone captured and isolated the pheromone and it is available to attach as a packet to pine trees. Large trees will need 4 packets. Smaller trees require only one. At $10 per packet, it is a more expensive option, but maybe more bird, animal and human friendly. Also, the packets are put out end of May and are supposed to cover the 100 days of beetle flight.
I lived in Grand Lake in 2003-2004. The preventative spraying of lodgepole pine trees was active then. As I go back and look at the areas which were sprayed, I find 95% failure of the preventative measures. There aren't many Ponderosa Pines in the Grand Lake area. The lodgepoles (densely packed) have taken a very serious hit. I will say the trees that are going to die in Grand County have died. in many cases, the trees on private property have been removed (harvested). GL homes which were built on wooded lots now have a lot with a view.
Bottom line: The tree death east of the continental divide is rapidly progressing. Two things could arrest the cycle:
1. Two to three weeks of -25 degrees or colder in the winter would arrest the progress of the insect infestation. The arctic air mass events were not uncommon a few decades ago. Rare now!
2. Or, large scale forest fires in the lodgepole forests would also stop the problem. The last big fire in RMNP was in the early 1900's. You can see evidence of this if you hike off-trail east of Lake Haiyaha. That fire activity is a normal part of the forest life cycle. But, it has been suppressed for a hundred years. The
Yellowstone fires of 1988 are a possible template for our RMNP future. A shock and a recovery, like Yellowstone's remarkable regrowth, is
the long term perspective.
Edited by hahn23, 12 August 2010 - 08:48 AM.