Clearwing Borer in a Tree. Photo courtesy of utahpests.usu.edu
About Clearwing Borers
The clearwing borers are moths which resemble wasps or hornets. Their name comes from their see-through wings. The larvae, which do all the damage, are unseen, living and feeding on the vascular tissue under the bark. The feeding and tunneling activity of the larvae interrupts the flow of water and nutrients within the tree, causing wilting and dieback in the limbs and crown. Their tunneling also structurally weakens limbs, making them susceptible to breakage. Signs of infestation will be exit holes in the trunk and “frass” (excrement) and/or sawdust outside the hole. Another visible sign could be the presence of the brown pupal case protruding from the hole.
Host Trees for Clearwing Borer
Ash, Linden, and many more.
Treatments for Clearwing Borer
Trees with Clearwing Borers can be treated with: TREE-äge®*, ACE-jet or AzaSol™.
Learn More About Common Tree Pests & Treatments
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*Important: Always read and follow label instructions before buying or using these products. The instructions contain important conditions of sale, including limitations of warranty and remedy. TREE-äge® Insecticide is a Restricted Use Pesticide and must only be sold to and applied by a state certified applicator. TREE-äge® is not registered for use in all states. Please check with your state or local extension service prior to buying or using this product. TREE-äge® is a registered trademark of Arborjet, Inc.
