The newest threat to trees in Ohio is the Hemlock Woolly Adelgid.  It is a sucking insect that targets Eastern and Carolina hemlocks.  It is a small aphid like insect that grows to a maximum size of less than 1/16”.  It is found on the underside of the needles from October to May and will produce a wooly covering that is white in color.  It sucks the sugars, stored in the needles, to survive on and can result in the eventual death of the tree.  It is currently found in 19 states from Georgia to Maine and has recently made its way into Ohio.  The life expectancy of trees that are infested can range from 4 years to more than 15 years.  There are control methods for the insect and early detection is key to helping the trees survive.