As 600-thousand deer hunters hit the woods this weekend, they’ll have to be more careful about where they put their tree stands. The tree killing emerald ash borer continues to spread across Wisconsin, and the state D-N-R says infected trees may not be strong enough to hold tree stands — and there’s also a risk that old branches can fall from above. Eau Claire forestry supervisor Matthew Staudenmaier tells television station  W-Q-O-W that trees can become “very dangerous in a relatively short period of time. He says it’s not a good idea to put stands in trees that appear to be dead or dying, regardless of the species — but he says ash trees can be especially brittle and fall “quite a bit easier.” The emerald ash borer arrived in Wisconsin in 2008 and has spread to 47 of the state’s 72 counties.