25 million Ash trees killed by Emerald Ash Borer DON’T DESTROY the Things You Love Asian Long Horned Beetle is a voracious pest of hardwood tree species such as maple, elm, ash, birch, poplar, horse chestnut, and London planetree. Vermont’s newest invader: Hemlock Wooly Adelgid threatens to kill thousands of hemlocks. Moving Firewood can spread invasive insects and diseases that KILL TREES. Use local sources of firewood buy firewood where you camp. A good Rule is : Never move firewood more than 50 miles.