Beetle Juice.

[SarK0Y]

And that's attracted swarms of mountain pine bark beetles so large, they get mistaken for rain clouds on airport radars in Prince George, B.C. The combined weight of beetles in the infestation over Homer, Alaska, equaled 3,300 killer whales, or half a million wolves flying over the forest.
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http://www.ravallirepublic.com/news/state-and-regional/article_17b631c9-ff2f-5011-911e-9a1243da9a5d.html

these Guys always been deadly efficient to produce largest & longest droughts.

[micjer]

Is it to be concerned about or is it part of nature's balance.  Same for forest fires.  They actually do a lot of good in the long term.