October 16, 2018 14:07 Updated Follow If you have a tree that is showing signs of distress, insect damage or disease, your best sources of information are DNR's Division of Entomology (http://www.in.gov/dnr/entomolo/) and Purdue University's Diagnostic Lab (http://www.ppdl.purdue.edu/ppdl/). Related articles Who can I contact about mud on the highway or material escaping trucks loaded with coal? How do I contact the Cabinet? Where can I ride my regular bicycle or my mountain bike? Where are the public fishing sites in Indiana? How do I get my building/house on historical listings?