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When should I treat for emerald ash borer?

Answered for Indianapolis, Marion County.

It has already moved through Indiana and killed the overwhelming majority of untreated ash. An untreated ash here is on a clock, not at risk. In Indianapolis, in Indiana DNR's 2008 statewide i-Tree STRATUM sample inventory, silver maple was the most common street tree in Indianapolis at 14.0% of 119,036 inventoried street trees, followed by sugar maple 6.0%, hackberry 5.1%, apple 4.9% and white ash 4.9% — that ash share is a pre-EAB-collapse figure and is effectively gone since emerald ash borer was confirmed in Indiana on April 21, 2004. The big silver maples over the 1920s-50s streets are the recurring job: included bark, codominant leaders and brittle wood that sheds limbs in every wind event. Treatable while the canopy is still mostly intact.

Indianapolis's canopy and what's at risk

In Indiana DNR's 2008 statewide i-Tree STRATUM sample inventory, silver maple was the most common street tree in Indianapolis at 14.0% of 119,036 inventoried street trees, followed by sugar maple 6.0%, hackberry 5.1%, apple 4.9% and white ash 4.9% — that ash share is a pre-EAB-collapse figure and is effectively gone since emerald ash borer was confirmed in Indiana on April 21, 2004. The big silver maples over the 1920s-50s streets are the recurring job: included bark, codominant leaders and brittle wood that sheds limbs in every wind event.

What to look for

Thinning from the top down, D-shaped exit holes about an eighth of an inch across, sprouts low on the trunk, and pale flecking where woodpeckers have stripped bark to get at larvae.

Whether the tree can be saved

Treatable while the canopy is still mostly intact. Once roughly a third of it is gone, treatment stops being worth the money and the tree becomes a removal — and a dead ash goes brittle unusually fast, which makes it both more dangerous and more expensive the longer it stands.

Timing in Marion County

Trunk injection in spring or early summer, repeated every one to two years for the life of the tree. It is a permanent commitment, not a cure.

Crews near Indianapolis

Sorted by distance

A1treeboyz of Indiana

1401 Lindley Ave, Indianapolis, IN 46241

No Google reviews yet
  • Tree Removal
  • Tree Trimming
  • Emergency Tree Service
  • +1

Listed on Google but not yet reviewed there. Ask them for recent local references when they call.

Listed direct: (317) 513-2407
4 Seasons Tree Service LLC, photo 1 of 3

4 Seasons Tree Service LLC

1360 E 30th St, Indianapolis, IN 46205

5.040
  • Tree Removal
  • Tree Trimming
  • Stump Grinding
  • +2

I had asked multiple tree companies to remove a partially fallen Ash tree that was lodged in between an adjacent tree. No company would touch it…

Jeff C. Indianapolis · 4 months ago · Google
Dave's Tree and Lawn, photo 1 of 3Photo author: Jessica Muldoon

Dave's Tree and Lawn

1138 S Drexel Ave, Indianapolis, IN 46203

4.916
  • Tree Removal
  • Tree Trimming
  • Stump Grinding
  • +1

Dave and his friendly crew cut down 4 trees, trimmed/thinned 7 more in 2 days! Great communication, quick response time, great price compared to…

Jon Caudle · a month ago · Google
Lulos Tree Service, Llc, photo 1 of 3

Lulos Tree Service, Llc

820 S Roena St, Indianapolis, IN 46241

5.015
  • Tree Removal
  • Tree Trimming
  • Stump Grinding
  • +2

Once again, Benito and his crew went above and beyond! We have used them twice for both tree removals and trimming/shaping. They are so professional…

Jenny Rollins · 2 years ago · Google
Nova Tree Care, photo 1 of 3

Nova Tree Care

4180 N Keystone Ave, Indianapolis, IN 46205

5.0193
  • Tree Removal
  • Tree Trimming
  • Stump Grinding
  • +3

We are absolutely thrilled with the work Brad and Nova Tree Care did on 3 of our backyard trees. Probably the best experience, and price, we’ve had…

Kathryn DeCloedt · 3 months ago · Google
A Tree's Worth Tree Care, photo 1 of 3

A Tree's Worth Tree Care

2213 E 45th St, Indianapolis, IN 46205

5.0109
  • Tree Removal
  • Tree Trimming
  • Stump Grinding
  • +2

I highly recommend A Tree’s Worth this company did an awesome job cutting down a large tree in my front yard. My first point of contact was with Sal…

Jacque Green · 4 months ago · Google

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