Chewed Log (IMAGE) Penn State Caption This photo shows tunneling by Asian longhorned beetles. By feeding on the wood and burrowing through tree limbs, making them weak, unstable and liable at any time to collapse on people below, the invasive insects have wreaked havoc on trees in urban areas. Credit US Department of Agriculture Usage Restrictions non commerical use only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.