I do not know what it is, and to be fair I will say, "some of these guys" (loggers) should not be cutting trees and doing any forestry work period. Some of them have no ability, and lack any concern for a stand of woods. Its fine to harvest, thin or what have you, but when you tow the logs out, don't damage the base of other good trees, like at my place, tall straight logs, cripes, use something to temporarily protect the standing ones if you must rub into them, say old conveyor belting, tires, short oversize culvert, cripes guys don't be so lazy, or short sighted and do the right thing, but no just asking to much for that, now he must have damaged a dozen in just a small area, the same way from towing, now they are breaking off, even though they look fine, wind will sort them all out eventually. Some of these guys steal, like its their right. They stole neighboring trees over the property line here.
People like these, I have an utter disdain for, it was a shame they were allowed in here, to a pristine stand of older maple, some oak, mostly maple, some others mixed in here and there. I can live with ruts, I can live with some clean up and what have you, but being a slob and damaging valuable trees that do not grow overnight is what ticked me off. Back then, I really had no say, did not own it, my father whom I differ with on handling things, me, I'd had a forestry guy in there, mark out, quantify, what have you, old man was tight on cash, taxes or last of mortgage due, could have lost it, fine have to log something like this our only stand of trees this size, do it right, nope... just let em in and do as they please, I threw them out and the guy knows I cannot stand him every time I see him I remind him of what a slob and half a$$ logger he thinks he is. I just do not like what they do and what it causes, the darned woods are a lot more unsafe because of what they did and I will end up with trees becoming firewood instead of mill or veneer logs, ok rant over now LOL !!!!!!!!!