Invasive insects have been wiping out tree species all over the country by creating serpentinelike tunnels inside the tree, making it weak and susceptible to breakage and death. In Pennsylvania, the emerald ash borer insect is close to wiping out more than 300 million ash trees. If a tree falls on your property and you decide to turn it into firewood, use it ONLY at your own home. Do not share infected wood with neighbors, and especially don’t bring any if you go camping. In some states, it is illegal to move any firewood from trees, logs, limbs, branches and roots from state to state.