Emerald Ash Borer 

Emerald Ash Borer (EAB), was first reported in Hudson in July 2018, in the commercial area along I-94.  EAB is a metallic green beetle ½ inch in length that is native to NE Asia.  The immature larvae (or worm) stage of the insect feeds on the inner bark, disrupting the tree’s ability to transport water and nutrients.  See the 30 second video “EAB Life Cycle” below.

Ash Identification:

Symptoms of EAB-infested trees include thinning or dying branches in the upper canopy, branch sprouts along the trunk and main branches, outer bark flecking (lightening) from larvae feeding by woodpeckers and vertical bark splits. 

EAB Identification:

When EAB was first found in St Paul in 2009, the City of Hudson began proactive management of EAB.  A 2010 complete pubic tree inventory found 1,400 ash along streets and in parks, 25% of all public trees.  Since then, 10% of the biggest and best of these ash have been protected with a systemic treatment on a 3 year cycle.  More defective and smaller ash are gradually being replaced with a diverse mix of long lived, lower maintenance shade trees. 

Treat The Best:

Important Information for Residents

Use these resources to learn how to identify ash trees, understand treatment options and  decide whether your ash tree is worth saving:

• Ash Tree Identification (PDF)
• EAB Life Cycle (30 second video)
• Hudson EAB Resource Guide (PDF)
• Homeowner's Decision Guide to EAB (PDF)
• Is My Ash Tree Worth Treating for EAB? (PDF)
• Protecting Your Tree From EAB (PDF)

Find more complete and detailed information at "Wisconsin's EAB Information Source"