** FILE ** An adult emerald ash borer is shown in this photo released by Michigan State University. Insect experts are telling people in not to bother treating their ash trees for the destructive insect called the emerald ash borer. Now that the emerald ash borer has made its way to Missouri, state experts doubt they can stop its spread. Their focus is on slowing it down. (AP Photo/Michigan State University, File) ** NO SALES **