Windsor’s majestic oak trees could be at risk of a spreading fungus that has already killed dozens across the border. Oak wilt appeared on Belle Isle in Detroit two years ago, and has killed more than 100 trees there already.  Windsor’s manager of forestry and natural areas, Paul Giroux, has been to the Michigan state park to check out the damage. “It was a little bit overwhelming, especially when you look over your shoulder and you see Windsor only a stone’s throw away,” he said. “There’s nothing better than actually going into the woodlot and to see the trees in decline yourself to really gain an appreciation for what a vascular wilt disease can do to giant, majestic trees.”