Learn about tree pests from Mauget’s experts.
Learn to identify different tree pests, which trees are susceptible to them, the damage they cause to trees, and how to get rid of them.
Emerald Ash Borer
The Emerald Ash Borer (EAB) has already been responsible for the death and decline of more than 25 million ash trees in the United States, according to the U.S. Department of Agriculture. It has a strong foothold in Michigan and in certain parts of Ohio, Indiana, Illinois, Pennsylvania, West Virginia and Maryland.
The Gypsy Moth is known to feed on the foliage of hundreds of species of plants in North America but its most common hosts are oaks and aspen. Gypsy Moth hosts are located through most of the US, but the highest concentrations of host trees are in the southern Appalachian Mountains, Ozark Mountains and in the northern Great Lakes States.
Hemlock Woolly Adelgid
Introduced into the Pacific Northwest in the 1920’s, the Hemlock Woolly Adelgid (HWA) was first reported in eastern Virginia in the early 1950’s, according to Virginia Technical. Since then, it has spread primarily northeast and now occurs as far north as Connecticut and Rhode Island.
There are more than 150 types of flathead borers in the US that threaten trees, including the Emerald Ash Borer that has killed untold millions of ash trees nationwide. They pose their chief threat as larvae that burrow beneath bark to gnaw the sapwood of trees, leaving winding tunnels packed with pale sawdust.
The effects of a clearwing borer infestation can range from almost no harm to complete devastation, depending on the clearwing borer species and the type of tree affected. These wood-boring insects have caused untold millions of dollars in damage to public and private trees and shrubs across the country.
Warm and Cool Season Mites
One of the most damaging, difficult to see and even harder to control invasive insect species is the mite. They are characterized by their extremely small size and ability to swarm and damage plants quickly. Mites damage trees by sucking chlorophyll directly from the leaves and needles of trees, hindering the plant’s ability to photosynthesize.
Across the United States, tent caterpillars cause destruction to many trees. They build a tent, made of their silk, in branch forks on trees. Caterpillars will leave the tent to feed on buds and leaves on the tree, leaving a trail of silk back to the tent. As the caterpillars grow and feed on the tree, the tent grows as well. A large group can eat all of the tree’s leaves and cover the tree in their webbing.