Certainly a possibility, I've had my hemlocks treated for HWA too. What seems different to me is that when HWA kills a hemlock they drop all their needles leaving just a bare tree. Looking at the trees on the end of Rattlesnake, they appear to be dead with their needles still on the trees but red/brown in color. Havent been close enough yet to determine if they and red pines or some other species.
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