How-To Features Tree Registry Register your trees for customized advice. Most damaging on younger trees during dry seasons. They attack healthy young trees boring into the heart and sapwood of stems and branches. Young larvae feeding in the spring cause bleeding at the site of the injury.
Wet spots are present on the bark.
Locust leafminer Black locust is the preferred host for the larval stage but the adults can be found feeding on apple, oak, birch, beech, elm, cherry, and hawthorn. Locust leafminers are known to feed on soybeans as both larvae and adults when populations are high. In many areas, the disease is most prevalent in elm, cottonwood, aspen and willow. The disease also affects species of ash, fir, maple, birch, hickory, beech, apple, mulberry, oak, sycamore, poplar, cherry, plum and linden. Contact us for suggestions .