Signs Of Infestation
Photo credit to emeraldashborer.info
Unfortunately, signs of the Emerald Ash Borer (EAB) aren’t usually noticeable until the tree is heavily infested with them. One good indication is the fading of green colour from the top section of an Ash, and a thinning, dying crown. Another obvious sign is thinning of the upper branches and (possibly) new sprouts emerging from the trunk once the crown has died.
Yet another sign is the presence of Woodpeckers. The bark of infested trees may split and the birds take advantage of this to remove it in large sections. Also look for distinctive, S-shaped patterns under the bark which larvae cause as they feed.
How Does The Emerald Ash Borer Kill?
Photo credit to emeraldashborer.info
Trees are in the most danger from larvae of the EAB. They destroy the layer just under the bark which delivers nutrients and water to the entire tree. When this delivery system is stopped, depending on the age of the tree and degree of infestation, within two to five years the tree could be dead. The green shoots which appear as the crown dies is the tree trying to find another way to transport vital nutrients. Eventually, as more of the crown dies out, the tree has no way to feed itself and starves to death.
Up Close Confirmation of Infestation
Photo credit to emeraldashborer.info
If you peel back the bark and see tube-like galleries full of droppings and sawdust you’ve likely spotted an infestation. You will probably also notice segmented, cream-coloured larvae. Adult beetles are bright green on the top side, and purple-red underneath the wings. Look for mature beetles to appear in May, leaving small D-shaped holes as they emerge from the tree. They then fly to a new tree and feed on its leaves so they can lay eggs on the bark. Those eggs produce larvae which will burrow underneath the bark and begin the cycle all over again.
Can Trees Be Saved From This Pest?
It is possible to save a tree from the EAB but it usually requires the service of professionals. The four best practices are preventative bark and foliage cover spray, soil and trunk injection, and a systemic bark spray. At Great Northern ReGreenery we have the skill and experience required to help. Call us today at (905) 775-7444 and we will be happy to assist you any way we can.