Under the supervision of USDA's Houping Liu, Ph. D. of Forest Entomology (the study of insects), nature center staff and DCNR workers tagged over 300 trees infected by the emerald ash borer (EAB), species Agrilus planipennis, an insect native to China. The larva of the emerald ash borer is what causes the damage to ash trees; they eat their way through the phloem and exit the outer bark in a D-shaped hole after they complete metamorphosis and turn into the adult beetle. The adult beetle then leaves the infested ash tree to move on to a new ash to infest and begin the process again. EAB generally has a 1-year life cycle. Many of the ash trees that were determined to be worth saving, that did not have a large percent of dieback or woodpecker damage, were injected with a chemical called TREE-äge. TREE-äge is an insecticide that is injected into the tree. The method of injection used in North Park is to drill several small holes into the base of the tree and insert needles attached to small bottle containing a mixture of TREE-äge. The tree then slowly uptakes the chemical as it would water and other nutrients through the injection site. EAB ingest the chemical as they eat the phloem tissue and die. Additional Integrated Pest Management activities included the release of parasitoid wasp species, and the removal and chipping of infested trees.
This is a picture of the damage the Emerald Ash Borer does to the tree beneath the bark layer.
This is a picture of the adult Emerald Ash Borer
(Actual size approximately 1/2 inch)
Larvae of the EAB
(Larvae up to 1 1/4 inches)
Tunnels of EAB Larvae
Exit hole of adult
For more information on EAB please visit the following websites:
Emerald Ash Borer.info - General Information
Stop the Beetle.info -US Dep. of Agriculture
PA DCNR Site on EAB