Symptoms of Emerald Ash Borer Infestation
Emerald ash borer (EAB) infestations often go undetected until the trees begin to show symptoms. A tree may be infested for a year or more before symptoms first appear. The symptoms listed below may indicate the presence of emerald ash borer:
D-shaped exit holes (approximately 1/8 inch in diameter) on the branches and trunk. These are often found first in the upper portions of the tree. Due to the rough texture of ash bark, the holes may be difficult to locate.
Larvae tunnel distinct serpentine (S-shaped) galleries packed with excrement under bark. Vertically split or cracked bark may occur above theses larval feeding galleries.
Photo credit: Art Wagner; USDA/APHIS/PPQ
Jagged holes produced by woodpeckers working to extract larvae from the tree. The tan color of these woodpecker sites stand out against the gray color of the bark.
Photo credit: Minnesota Department of Agriculture
A large number of shoots or suckers can grow below the dead portions of the tree, particularly at the tree base. This usually happens when the tree has been infested for some time and a large portion of the canopy has died.
- Emerald Ash Borer 66%
Emerald Ash Borer Information for the Homeowner and for Community Groups/Green Industry Community Groups/Green Industry The Community Trees program at The Morton Arboretum has prepared a new guide for use by municipal leaders as well as...
- Emerald Ash Borer Identification 65%
Emerald ash borer (EAB) adults are bright metallic green beetles that are approximately 1/2 inch long and 1/16 inch wide. They have flat backs and rounded abdomens. Larvae reach a length of approximately 1 inch and are creamy white, flattened, and...
- April 8, 2011 25%
This issue contains details on many items including: bagworms, hemlock needle miner, woolly alder aphid, arborvitae leafminer, winter damage, salt damage, and emerald ash borer in Illinois Indicator plant: Diane Hybrid Witch-Hazel...
- August 28, 2009 Plant Health Care Report 22%
This issue contains details on:emerald ash borer, yellow-necked caterpillar, milkweed tussock moth, soldier beetle, Phomopsis on Douglas fir, butternut canker, Pestalotiopsis blight, bullseye leaf spot, smooth patch, stinkhorns,common ragweed,An...
- May 21, 2010 21%
This issues contains details on many items including: early emerald ash borer, ash/lilac borer, hackberry nipple gall, Phylloxera gall, imported currant worm, calico scale, terrapin scale, daylily leaf streak, Dutch elm disease, Phomopsis gall on...
- Plant Health Care Report June 10, 2011 (Issue 2011.08) 21%