• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
  • Skip to footer
  • Monthly Checklist
  • Container Garden Design
  • Garden Coaching
  • Five ★★★★★ Speaker’s Topics
  • Portfolio

Hoosier Gardener

An informed, yet personal take on natural gardening in Indiana and other dirty topics.

An informed, yet personal take on natural gardening in Indiana and other dirty topics.
  • Home
  • Services
    • Container Garden Design
    • Garden Coaching
    • Writing & Editing
    • Virtual and In-person Talks
  • Indiana Gardening Resources
    • Monthly Gardening Checklist
    • Hoosier Gardener Blog
    • HortusScope
  • About
  • Contact
  • Shop

March 30, 2019 By Jo Ellen Meyers Sharp

New methods to managing emerald ash borer

Trees with up to 30 percent thinning have a chance of being saved after an emerald ash borer infestation. Photo courtesy Cliff Sadof/Purdue Extension Entomologist.

I recently stumbled into an informative, hour-long webinar from Purdue University Extension, drawn in by updated information on how we can fight the emerald ash borer. The day was cold and windy, and yes, I have an ash tree in my yard.

As a brief refresher, EAB was first detected in Indiana in 2002. Since then, it has killed tens of thousands of ash trees (Fraxinus spp.), moving quickly throughout the Midwest and elsewhere, spread mostly by contaminated firewood.

Tiny, metallic green beetles feed on the leaves and lay eggs in the bark. The eggs hatch and the larvae bore into the tree. The larvae destroy the layers that move water and other nutrients to branches, limbs and leaves, eventually starving the tree to death.

Initially, experts recommended treating ash trees or cutting them down, whether infested or not. The result, healthy but threatened trees were removed because annual treatment was expensive for municipalities, park systems and government entities. Homeowners were told to treat ash trees if they were important in the landscape and to take down others.

New info

Researchers have had more than 17 years to study this exotic invasive insect from Asia and have new recommendations and a warning.

  • Monitoring all species of ash trees in your landscape, neighborhood or public areas is critical. Woodpeckers at the top of a tree may be an important indicator of trouble.
  • The earlier you detect thinning at the top of an ash tree, called canopy loss, the better your chances it will recover with treatment. Trees with up to 30 percent canopy damage can be treated and likely saved.
  • Three-year protection is a reality. Rather than annual or every two-year insecticide applications, they may be needed only every three years. These insecticides are injected into the trunk of the tree, but are not available to homeowners. Certified pesticide applicators or arborists need to apply these chemicals.
  • Cost of treatment is competitive with taking an ash tree down and replanting another species of tree. An older also tree has more value in a landscape.
  • Of course, you always want to work with a certified arborist (treesaregood.org). These highly trained professionals carry proper insurance, licenses and other certifications to do the job, protecting themselves, you and your property. Avoid what we call trunk-slammers, the folks who walk the neighborhood offering to trim your trees.
  • Researchers are exploring parasitic wasps as a possible control.
  • Researchers are studying ash trees that have survived an EAB infestation to see if they have some type natural resistance.

Hazard warning

He said we’ll never get rid of EAB, but that it’s possible to knock it back. Also, he said, don’t replant ash trees with more ash trees.

Dead ash trees are a threat to public health, Cliff Sadof said in the video. Research indicates the trees become weak and hazardous as soon as two years after EAB infestation. “They become incredibly brittle,” the Purdue Extension entomologist said.

Branches and limbs fall during wind, heavy rains and other environmental influences, even vibrations. But their brittleness heightens the hazard for arborists who take the tree down. “I can’t emphasize how scary it is,” Sadof said. “We don’t have to have ash trees that die,” with proper treatment and management.

More EAB resources

  • Emerald Ash Borer Management
  • Practical EAB Management Video: A 2019 Update
  • Emerald Ash Borer Information Network

Filed Under: Hoosier Gardener

Primary Sidebar

Get the Hoosier Gardener Newsletter

Follow Us!

  • Email
  • Facebook
  • Instagram
  • Twitter

Recent Posts

April 2025 Plant of the Month: Spicebush

The northern spicebush (Lindera benzoin) is loaded with special features and ...

[Read More...]

April garden checklist

Indoors Prune, repot and clean houseplants, as needed.Fertilize houseplants ...

[Read More...]

March 2025 Plant of the Month: Daffodil

You just can’t go wrong with daffodils. They reliably return every year and ...

[Read More...]

March garden checklist

Indoors Prune, repot and clean houseplants as needed. Fertilize houseplants ...

[Read More...]

Footer

Quick Links

Shop
Speaking
Container Garden Design
Monthly Gardening Checklist
Contact

Get the Hoosier Gardener Newsletter

Contact

Jo Ellen Meyers Sharp
The Hoosier Gardener
thehoosiergardener@gmail.com

Copyright © 2025 · Hoosier Gardener - All Rights Reserved · Privacy Policy · Terms of Service ·Sitemap

Affiliate disclosure: Amazon links are affiliate links and Jo Ellen will receive a small commission from items purchased via the links.

We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept”, you consent to the use of ALL the cookies.
Do not sell my personal information.
Cookie SettingsAccept
Manage consent

Privacy Overview

This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary
Always Enabled
Necessary cookies are absolutely essential for the website to function properly. These cookies ensure basic functionalities and security features of the website, anonymously.
CookieDurationDescription
cookielawinfo-checkbox-analytics11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics".
cookielawinfo-checkbox-functional11 monthsThe cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional".
cookielawinfo-checkbox-necessary11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary".
cookielawinfo-checkbox-others11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other.
cookielawinfo-checkbox-performance11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance".
viewed_cookie_policy11 monthsThe cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data.
Functional
Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features.
Performance
Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors.
Analytics
Analytical cookies are used to understand how visitors interact with the website. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc.
Advertisement
Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. These cookies track visitors across websites and collect information to provide customized ads.
Others
Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet.
SAVE & ACCEPT