Looks like regular blanket moss on limbs, but underneath the moss. Is IMOP, a saw chains worst enemy!
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Volcanic Ash!
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The ash on the limbs of these trees never really dries up because its a very damp climate on the Island. When the ash gets saturated after big rains in the winter and then freezes. You might as well be sawing into a piece of concrete sitting on a limb! One or to pass's through limbs when frozen. The chain is done until retuned!
Some Spruce Grove's on the Island have worse ash conditions than others. In the Summer, when in a strip with bad conditions. Sometimes only five or six trees can be fell and worked up into a couple logs before having to swap chains. In the Winter time. Believe me when I say Im not exaggerating and a Faller can go through two round files a day when the ash conditions are at their worst!
I've spent as much time filing as sawing in a 6.5 hour work day before! Let me tell you. IT SUCKS!