Emerald Ash Borer

What to look for

Beginning in May the adult emerald ash borers emerge from under the bark and are present through August. Each adult leaves a D-shaped exit hole in the bark. They feed on ash leavesEAB_onpenny throughout the 3-6 week life span. Their feeding does not damage or affect the tree. Adults Emerald Ash Borers mate on the bark of trees after about a week of feeding and building strength. Eggs are laid on the surface of the bark, in bark cracks and crevices or just under the outer bark of ash trees. The eggs, which EAB_trunkare very small and reddish-brown, may be laid in groups or individually.  Eggs hatch in 2-3 weeks and the larvae immediately begin chewing through the outer bark to the phloem. Larvae begin feeding in late July, but most feeding and growth occur from August to October. Larvae feed in S-shaped tunnels, called galleries, in the phloem. As the larva feeds and grows, the galleries get larger. The galleries disrupt the transport of nutrients and water within, thus killing the tree.

How to prevent the spread

The Emerald Ash Borer is easily transported in hardwood and ash log firewood.  State and EAB_onleafFederal quarantine restrictions prohibit the movement of firewood due to the possible spread of the Emerald Ash Borer.  Firewood should only be purchased locally from a known source.  All firewood should be used during the cold months so that emerald ash borer larvae or adults do not survive on logs left through the spring.

Monitor your tree's health

The health of ash trees should be monitored by looking for dead and dying branches at the top of the tree’s crown.  City Arborist, Gary Johnson, is the City of Galesburg’s local official authorized to conduct inspections of Ash trees within the City’s jurisdiction.  Residents of Galesburg should contact Arborist Johnson for a site inspection if symptoms are seen on an Ash tree.

For more information on the Emerald Ash Borer, consult the Illinois Department of Agriculture website.


view more

Local Events


October 2018
01 02 03 04 05 06
07 08 09 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30 31
view more

News & Announcements

Join Our Mailing/Alert List
Follow Us: Facebook Twitter RSS
City of Galesburg; 55 W. Tompkins Street; Galesburg, IL 61402-1387|Phone: 309-343-4181|Directions|Contact Us|Intranet
©2018 City of Galesburg.|Web site design and development by Americaneagle.com|Privacy Policy|Terms & Conditions|Site Map