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

[Spencer, Sandy]

I used to use oil-based triclopyr (Garlon 4) at about 15-25% on tree of heaven for basal bark treatments (for trees left standing as one might do for many small saplings or if no help available for cutting bigger trees).  If you have the labor available to help you remove the cut and remove trees, that's all the better, less herbicide  needs applied.   You can reduce the rate %  to 5% I believe, but check label on this.    Have to be careful when applying triclopyr on hot days though, it volatolizes.    Thanks for getting rid of tree of heaven!

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From: MAIPC <maipc-bounces at lists.maipc.org> on behalf of Ossi, Damien (DOEE) <damien.ossi at dc.gov>
Sent: Monday, August 7, 2023 10:48 AM
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Subject: [EXTERNAL] [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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