[MAIPC] [EXTERNAL] Re: Basal oil on ailanthus as stump treatment

Fri Aug 11 12:08:13 PDT 2023

Thanks, everyone, for your responses.  This was very helpful.    I have been pushing for the hack-and-squirt method, but it looks like we only have the funding for one visit to each site.  I’ll keep the listserv updated on our results using cut-stump methods on ailanthus (using either basal oil or water-based triclopyr on the cut surfaces).

Damien

Damien Ossi
Wildlife Biologist
Fisheries and Wildlife Division
Department of Energy and Environment
202-741-0840
damien.ossi at dc.gov

From: MAIPC <maipc-bounces at lists.maipc.org> On Behalf Of Mims, Ray
Sent: Wednesday, August 9, 2023 3:05 PM
To: Jeffrey Branham <jbranham at prescott.edu>
Cc: MAIPC Listserve <maipc at lists.maipc.org>
Subject: Re: [MAIPC] [EXTERNAL] Re: Basal oil on ailanthus as stump treatment

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All the literature I have seen indicates that is the best method.
Ray

On Aug 9, 2023, at 3:02 PM, Jeffrey Branham <jbranham at prescott.edu<mailto:jbranham at prescott.edu>> wrote:

What do folks think about winter basal oil treatments?

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On Tue, Aug 8, 2023 at 10:58 AM Conner McBane <cmcbane at appalachiantrail.org<mailto:cmcbane at appalachiantrail.org>> wrote:
Hey Damien,

We use Garlon 4 and basal oil on ailanthus a lot in Southwest and Central Virginia with great results. I have used both glyphosate and triclopyr on ailanthus and I've found anecdotally that triclopyr always works best for this species.

We use 20% triclopyr and 80% basal oil mix and we have leaned towards hack and squirt and basal bark. I have had good success with basal bark on ailanthus, but you use more chemical and some non-target treatment will happen depending on proximity. With that said, we use the same mix for autumn olive and bush honeysuckle as a basal bark for anything too large to foliar and it works really well for that application too. Basal bark treatment should wait at least 30 days before cutting. I do not recommend cut-stump treatment for ailanthus because you don't have enough translocation to the entire root system and a lot of suckers are likely. If you HAVE to do a cut-stump treatment and they are large DBH I would treat the cut surface and buttress roots/stem. You will probably have some resprouts, but you can try to foliar those as they come up.

Once you treat standing ailanthus, the stems are likely to drop within 2 years' time so just be aware of that additional hazard if you go that route in the future. You can also buy some PathFinder II which is basal oil/triclopyr RTU herbicide at 20% and it saves the hassle of mixing, but it is a little bit more expensive.

Let me know if you have any other questions and I'm happy to help! I also have a contractor who can help out up there, they are located in Charlottesville, but willing to travel.

Cheers,

Conner McBane
Natural Resource Manager
Appalachian Trail Conservancy
416 Campbell Ave | Suite 101
Roanoke, VA 24016
Phone: 540-427-7098
Cell: 540-525-6812
Fax: 540-904-4368
cmcbane at appalachiantrail.org<mailto:eprice at appalachiantrail.org>
www.appalachiantrail.org<http://www.appalachiantrail.org/>
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Subject: [MAIPC] Basal oil on ailanthus as stump treatment

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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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Cheers,
  JB
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