[MAIPC] Basal oil on ailanthus as stump treatment

[Todd Hagenbuch]

Damien:

I know Art Gover did some studies on controlling Ailanthus with herbicide.  Unfortunately, the worst results on Ailanthus would be cut stump treatment(well worse would be no herbicide at all).  I would expect some sprouting still using that cut stump option.  Hack n Squirt with 50/50 glyphosate late in growing season (now thru late-October) leaving a little bit of intact bark between each hack works really well on the larger trees.  Basal applications with Garlon 4 Ultra 25% and Basal oil 75% work well in the same period for your smaller stems under 4”.  These are the results that Art produced doing his own research on Ailanthus.  If you decide you will be cutting these trees down after herbicide treatment, I would like to see at least 6-8 weeks after the treatment is made.

Hope this helps,

Todd Hagenbuch
Manager/ Veg. Mgmt. Specialist
Arborchem Products
941 Nixon Drive
Mechanicsburg, PA 17055
570-401-7098
www.arborchem.com<http://www.arborchem.com/>

From: MAIPC <maipc-bounces at lists.maipc.org> On Behalf Of Mike Van Clef
Sent: Monday, August 7, 2023 11:07 AM
To: Ossi, Damien (DOEE) <damien.ossi at dc.gov>
Cc: MAIPC Listserve <maipc at lists.maipc.org>
Subject: Re: [MAIPC] Basal oil on ailanthus as stump treatment

Hi Damien, Cutting them in general makes me nervous, but sounds like it is a requirement in your case. My instinct would be to go with triclopyr rather than glyphosate. But maybe another option is EZJect with imazypyr? It works well in zapping
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Hi Damien,

Cutting them in general makes me nervous, but sounds like it is a requirement in your case.

My instinct would be to go with triclopyr rather than glyphosate. But maybe another option is EZJect with imazypyr? It works well in zapping existing connected sprouts.

-Mike


Michael Van Clef, Ph.D.
Stewardship Director, Friends of Hopewell Valley Open Space
Program Director, New Jersey Invasive Species Strike Team
Principal, Ecological Solutions, LLC

Office: 609-730-1560
Mobile: 908-528-6674


On Mon, Aug 7, 2023 at 10:51 AM Ossi, Damien (DOEE) <damien.ossi at dc.gov<mailto:damien.ossi at dc.gov>> wrote:
Hi MAIPC members,

Does anyone use oil-based triclopyr rather than water-based on ailanthus as a stump-cut treatment?  We’re looking to remove a large number of ailanthus in DC before the spotted lanternflies arrive in force, and the vendor is proposing to do a stump-cut treatment with triclopyr.  I want to recommend that they use Garlon-4 or equivalent rather than Garlon-3a or equivalent, because the herbicide can be applied to both the sapwood on the stump and the bark on base of the stump.  But I also saw a study from Italy that indicated that glyphosate is better for stump-cut treatment of ailanthus.

The trees must be removed at the time of treatment, so using hack-and-squirt or typical basal bark treatments won’t fly.  Any advice from the membership?

Thanks,
Damien


Damien P. Ossi
Wildlife Biologist
Fisheries & Wildlife Division
Department of Energy & Environment
Government of the District of Columbia
1200 First Street NE, 5th Floor
Washington, DC 20002
(202) 741-0840
damien.ossi at dc.gov<mailto:damien.ossi at dc.gov>


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