[MAIPC] Mugwort Control

Sun Mar 29 06:33:20 PDT 2020

concur
Melissa A. Bravo, M.S. CCA, Agronomist Meadow Lake Farm Consulting Services 814-574-4067 / bravomelissa at yahoo.com 

    On Saturday, March 28, 2020, 10:34:34 PM EDT, Gover Jr., Arthur Earl <aeg2 at psu.edu> wrote:  

 All,
A point of clarification. We are discussing treatment in a non-optimal window to ease application and increase selectivity. It would be interesting to see if persistent use of this approach will remove mugwort from a site and release the desired species. To date, my experience has been that to  truly dispense with mugwort, later-season treatment with potent herbicides has been demonstrated to be the effective approach.
Our project compared multiple rates of clopyralid (CLP), aminopyralid (AMP), or aminocyclopyrachlor (ACP) in an experiment applied in October 2018. These are all broadleaf herbicides that feature a high level of activity against composites and legumes (in general), have significant soil activity, and are generally safe to grasses and graminoids. We found ACP to provide reduction between 94 and 99 percent 1 year later, which was significantly more potent than CLP (8 to 65 percent). Reduction in AMP-treated plots ranged from 76 to 81 percent.
Eliminating mugwort from a site is seemingly akin to removing Canada thistle. It can be done, but requires a  multiple-operation program and fully executing it. If you miss a step, the mugwort reboots to some degree, prolonging the program.
Be well.
Art
Penn State Wildland Weed Management116 ASI Building
University Park, PA  16802

(814) 863-9904
(814) 863-6139 FAX
http://plantscience.psu.edu/wildland

On Mar 28, 2020, at 21:04, Nathan Hartshorne <nshartshorne at gmail.com> wrote:
If I recall correctly, 2% is pretty standard for foliar applications, but I just found a WVU page that suggests 3-4%.  Plenty of stuff works on mugwort (I used 2, 4-D effectively as wll), it's just a matter of making sure one gets around to it.  In a different attempt, I once had some engineer get us to plow mugwort which failed miserably since the root fragments are happy to grow back.

https://extension.wvu.edu/lawn-gardening-pests/weeds/mugwort
On Fri, Mar 27, 2020 at 5:45 PM Moore, April -FS <april.moore at usda.gov> wrote:

Do you find a particular percent solution of glyphosate better than another?

Thanks.

From: MAIPC [mailto:maipc-bounces at lists.maipc.org]On Behalf Of Nathan Hartshorne
Sent: Friday, March 27, 2020 4:59 PM
To: Gover Jr., Arthur Earl <aeg2 at psu.edu>
Cc: MAIPC Listserve (maipc at lists.maipc.org) <maipc at lists.maipc.org>
Subject: Re: [MAIPC] Mugwort Control

We have a surprising range of sprout times from Virginia up to northern PA/jersey as well as other mountainous regions, so that does not surprise me yours hasn't sprouted.  Where I am in Philly it is a few inches tall already.  So there is certainly no problem waiting until yours has sprouted and then let it get a couple inches.

I have used a few different herbicides including glyphosate and clearcast, but have no personal preference.  It takes a long time with each different one to get a preference, and I did not have that, so I have no particular recommendation.  My recommendation really was just about the strategy to start early.  Mugwort can take over a field if ignored, and spraying only in the fall after it seeds has not shown me any particular usefulness.  So if you hit it when it is young short, it is easy to avoid hitting other plants, helps suppress mugwort height, and does kill a fair percent of the plants.

On Fri, Mar 27, 2020 at 4:05 PM Gover Jr., Arthur Earl <aeg2 at psu.edu> wrote:

Hi, Nathan.

Could you elaborate on the current stage of the mugwort your addressing. In Central PA, mugwort emergence is in the future.

What material are you using?

Thanks.

Be well.

Art

Penn State Wildland Weed Management
116 ASI Building
University Park, PA  16802

(814) 863-9904
(814) 863-6139 FAX
http://plantscience.psu.edu/wildland

> On Mar 27, 2020, at 15:23, Nathan Hartshorne <nshartshorne at gmail.com> wrote:
> 
> Hi All,
> 
> I just wanted to say that in the past I have had success reducing mugwort invasions by spraying at this point of the year when it is still short and a lot of the natives still haven't even shown their sprouts.  Now I got maybe as little as 20% killed and the rest grew back, but that 20% was very helpful in thin areas.  Also, the mugwort that did resprout grew shorter and was significantly easier to manage later in the season when I hit it again.  If you have ever waded through a field of 5 ft tall mugwort trying to spray it with a backpack sprayer, it is not easy.  Anyways, just some advice.
> 
> Best,
> Nathan
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