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All,
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<div class="">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.</div>
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<div class="">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.</div>
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<div class="">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.</div>
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<div class="">Be well.</div>
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<div class="">Art</div>
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<div class="">Penn State Wildland Weed Management</div>
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<div>116 ASI Building<br class="">
University Park, PA 16802<br class="">
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(814) 863-9904<br class="">
(814) 863-6139 FAX<br class="">
<a href="http://plantscience.psu.edu/wildland" class="">http://plantscience.psu.edu/wildland</a></div>
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<div class="">On Mar 28, 2020, at 21:04, Nathan Hartshorne <<a href="mailto:nshartshorne@gmail.com" class="">nshartshorne@gmail.com</a>> wrote:</div>
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<div class="">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.<br class="">
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<div class=""><a href="https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fextension.wvu.edu%2Flawn-gardening-pests%2Fweeds%2Fmugwort&data=02%7C01%7Caeg2%40psu.edu%7C792def891eab4577a47708d7d37d3781%7C7cf48d453ddb4389a9c1c115526eb52e%7C0%7C0%7C637210407071272860&sdata=ri69eLO3%2BceXoVgRRXgRDiC%2Bu6suuQPTLd3HgLlM8cQ%3D&reserved=0" originalsrc="https://extension.wvu.edu/lawn-gardening-pests/weeds/mugwort" shash="OW6KFCDbYB7OP6Bx9q2KvjY4UXaXOFujs+HLJODjRG4kt5fKQQqGGWoUPu6+y1lJrvsv1wXzbmCQAYZx765uiwk5HggriWwiWUbbbm5ZvEwM1v0Wcc5RyVw5iiDacQJPc7hJRA5Gb7y/QsDRezXgaHIIfXKv/sEbpJtw5s30brM=" class="">https://extension.wvu.edu/lawn-gardening-pests/weeds/mugwort</a></div>
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<div dir="ltr" class="gmail_attr">On Fri, Mar 27, 2020 at 5:45 PM Moore, April -FS <<a href="mailto:april.moore@usda.gov" target="_blank" class="">april.moore@usda.gov</a>> wrote:<br class="">
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<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri",sans-serif;color:rgb(31,73,125)" class="">Do you find a particular percent solution of glyphosate better than another?<u class=""></u><u class=""></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri",sans-serif;color:rgb(31,73,125)" class=""><u class=""></u> <u class=""></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri",sans-serif;color:rgb(31,73,125)" class="">Thanks.<u class=""></u><u class=""></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri",sans-serif;color:rgb(31,73,125)" class=""><u class=""></u> <u class=""></u></span></p>
<p class="MsoNormal"><b class=""><span style="font-size:11pt;font-family:"Calibri",sans-serif" class="">From:</span></b><span style="font-size:11pt;font-family:"Calibri",sans-serif" class=""> MAIPC [mailto:<a href="mailto:maipc-bounces@lists.maipc.org" target="_blank" class="">maipc-bounces@lists.maipc.org</a>]
<b class="">On Behalf Of </b>Nathan Hartshorne<br class="">
<b class="">Sent:</b> Friday, March 27, 2020 4:59 PM<br class="">
<b class="">To:</b> Gover Jr., Arthur Earl <<a href="mailto:aeg2@psu.edu" target="_blank" class="">aeg2@psu.edu</a>><br class="">
<b class="">Cc:</b> MAIPC Listserve (<a href="mailto:maipc@lists.maipc.org" target="_blank" class="">maipc@lists.maipc.org</a>) <<a href="mailto:maipc@lists.maipc.org" target="_blank" class="">maipc@lists.maipc.org</a>><br class="">
<b class="">Subject:</b> Re: [MAIPC] Mugwort Control<u class=""></u><u class=""></u></span></p>
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<p class="MsoNormal">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.<u class=""></u><u class=""></u></p>
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<p class="MsoNormal">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.<u class=""></u><u class=""></u></p>
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<p class="MsoNormal">On Fri, Mar 27, 2020 at 4:05 PM Gover Jr., Arthur Earl <<a href="mailto:aeg2@psu.edu" target="_blank" class="">aeg2@psu.edu</a>> wrote:<u class=""></u><u class=""></u></p>
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<p class="MsoNormal" style="margin-bottom:12pt">Hi, Nathan.<br class="">
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Could you elaborate on the current stage of the mugwort your addressing. In Central PA, mugwort emergence is in the future.<br class="">
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What material are you using?<br class="">
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Thanks.<br class="">
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Be well.<br class="">
<br class="">
Art<br class="">
<br class="">
Penn State Wildland Weed Management<br class="">
116 ASI Building<br class="">
University Park, PA 16802<br class="">
<br class="">
(814) 863-9904<br class="">
(814) 863-6139 FAX<br class="">
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> On Mar 27, 2020, at 15:23, Nathan Hartshorne <<a href="mailto:nshartshorne@gmail.com" target="_blank" class="">nshartshorne@gmail.com</a>> wrote:<br class="">
> <br class="">
> Hi All,<br class="">
> <br class="">
> 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.<br class="">
> <br class="">
> Best,<br class="">
> Nathan<br class="">
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