UDQuickly Home My Old House Snapshots UD Magazine
Send A Class Notes


University of Dayton Magazine
Ryan McEwan and Amur honeysuckle by Larry Burgess

Stopping an invader

1:20 PM  Nov 12th, 2012
by Cilla Bosnak Shindell

As leaves drop in autumn, it’s not only a good time to enjoy the reds, yellows and oranges drifting from the trees — it’s also a good time to kill honeysuckle.

Amur honeysuckle, a highly aggressive invasive woody shrub, is rapidly taking over millions of acres in the eastern and midwestern United States in a sort of ecological equivalent of Sherman’s March.

“If you’re driving along a woods in the fall, you’ll see all these shrubs that are still green after all of the trees have lost their leaves,” said Ryan McEwan, assistant biology professor. “That’s honeysuckle, and it’s very much in evidence. It can hold its leaves into December.”

The honeysuckle can grow to 20 feet tall and pushes out virtually all native species, creating an uninterrupted monoculture where once a diversity of plants supported native wildlife, he said.

McEwan researches the basic biology of honeysuckle; just this year, three journals — American Midland Naturalist, Plant Ecology and Biological Invasions— have published research he either wrote or co-wrote on the shrub. His focus is to find out which traits enable it to move in so quickly and so completely, despite being a “minor player” in its own native habitat along the Amur River in China

One of those traits is extended leaf time, creating a thick canopy of leaves that shades out light from native plants and can last from early spring into early winter. But that very trait also makes an opening for homeowners and landowners to attack it.

The best time is late October and early November, when all the other plants are bare and the honeysuckle is still hanging on to its leaves. By spraying it with an herbicide such as glycosophate (the active ingredient in Round-Up), McEwan said the leaves take up the herbicide and transport it into the plant, while minimizing the impact on native plants. So, when the plant finally drops its leaves, they don’t come back in the spring.

That method works, along with staying ahead of small invasions by pulling young plants, he said. And it’s worth the effort.

“The level of energy and investment it takes to eradicate it and then to restore the native species is enormous,” he said.

To learn more about Amur honeysuckle, McEwan recommends visiting the Ohio Invasive Plants Council and the USDA Amur honeysuckle sites.

One Response to Stopping an invader

  1. Tom Olsen says:

    I am a volunteer steward at the Morton Arboretum involved in restoring woodlands. The Ohio DNR site lists Garlon4 as effective on honeysuckle stump treatment. This interests me since usually only glyphosate is said to control amur honeysuckle. Since Garlon4 can be mixed with oil, if effective,it would allow treatment into colder weather. Do you have an opinion as to Garlon4’s effectiveness on honeysuckle?

Leave a Reply

Your email address will not be published. Required fields are marked *

Connect with Facebook


You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>

  • Summer volleyball by Larry Burgess
  • creche set up by Larry Burgess
  • pins on a map
  • clay pillars
  • Weight training for baseball team by Larry Burgess
  • Setting up for volleyball in fc gym by Larry Burgess
  • 5.13.15
  • 051006survey
  • alumni hall cross painter in the summer by Larry Burgess
  • Cat by Keller Hall by Larry Burgess
  • Theater department builds two porches for Reunion Weekend 2015 by Larry Burgess
  • 010809snowb
  • 012709table
  • andy robillard and dog allie ride through ku plaza by Larry Burgess
  • student on couch
  • Canada goose on Alumni Hall by Zoey Xia
  • Weather station in D Lot by Larry Burgess
  • Roesch Library colonnade gets fresh paint by Larry Burgess