<div dir="ltr">I definitely agree that knotweed is being spread by dispersal of viable fragments through events like flooding but also significantly by direct human activities where contaminated fill is applied to a site and/or contaminated equipment is used at a new location. My favorite example is is Maine where I observed many utility poles, each surrounded by a patch of knotweed, and surmised that contaminated auger drills had been used to "plant" the poles. Quite the way to vector the problem widely. Admittedly that's personal observation and conjecture. <br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, May 9, 2019 at 11:53 AM Rohrbaugh, Andrew <<a href="mailto:anrohrbaug@pa.gov">anrohrbaug@pa.gov</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri",sans-serif">I don’t think there’s much evidence of seed production, although I recall someone studying the genetics of knotweed- Norris, do you recall that study?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri",sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri",sans-serif">Knotweed is difficult to kill, but there’s some tricks to it (mowing it down first, letting it regrow, then spraying it)… and you have to keep after the patches. It’s got a
really strong root system, and once it gets started in a disturbed area (due to a root fragment moving in during disturbance) subsequent disturbances make it hard to get other species established.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri",sans-serif"><u></u> <u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:10pt;font-family:"Verdana",sans-serif;color:rgb(23,54,93)">Andrew Rohrbaugh</span></b><span style="font-size:10pt;font-family:"Verdana",sans-serif;color:rgb(11,52,104)"> | Botanist<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Verdana",sans-serif;color:rgb(11,52,104)">Pennsylvania Department of Conservation & Natural Resources<br>
Bureau of Forestry | Ecological Services Section<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Verdana",sans-serif;color:rgb(11,52,104)">PO Box 8552, 400 Market St, Harrisburg, PA 17105-8552<br>
</span><span style="font-size:10pt;font-family:"Verdana",sans-serif;color:rgb(102,172,45)">Phone:</span><span style="font-size:10pt;font-family:"Verdana",sans-serif;color:rgb(11,52,104)"> 717.705.2823 |
</span><span style="font-size:10pt;font-family:"Verdana",sans-serif;color:rgb(102,172,45)">Fax:</span><span style="font-size:10pt;font-family:"Verdana",sans-serif;color:rgb(11,52,104)"> 717.772.0271<br>
<a href="mailto:anrohrbaug@pa.gov" target="_blank">anrohrbaug@pa.gov</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri",sans-serif"><a href="http://www.dcnr.state.pa.us/" target="_blank"><span style="font-size:10pt;font-family:"Verdana",sans-serif;color:rgb(18,59,121)">www.dcnr.state.pa.us</span></a></span><span style="font-size:10pt;font-family:"Verdana",sans-serif;color:rgb(11,52,104)"><u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11pt;font-family:"Calibri",sans-serif"><u></u> <u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:11pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11pt;font-family:"Calibri",sans-serif"> MAIPC [mailto:<a href="mailto:maipc-bounces@lists.maipc.org" target="_blank">maipc-bounces@lists.maipc.org</a>]
<b>On Behalf Of </b>frazmo<br>
<b>Sent:</b> Thursday, May 09, 2019 11:41 AM<br>
<b>To:</b> MAIPC Listserve <<a href="mailto:maipc@lists.maipc.org" target="_blank">maipc@lists.maipc.org</a>><br>
<b>Subject:</b> [External] [MAIPC] Slate Article on Japanese Knotweed<u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
<p><b><i>ATTENTION: </i></b><i>This email message is from an external sender. Do not open links or attachments from unknown sources. To report suspicious email, forward the message as an attachment to
<a href="mailto:CWOPA_SPAM@pa.gov" target="_blank"><span style="font-style:normal">CWOPA_SPAM@pa.gov</span></a>.</i><u></u><u></u></p>
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<p class="MsoNormal">Read this article if you want to experience real terror...<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><a href="https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fslate.com%2Ftechnology%2F2019%2F05%2Fjapanese-knotweed-invasive-plants.html&data=02%7C01%7Canrohrbaug%40pa.gov%7Cd84b1837366f42e87e4708d6d494bd90%7C418e284101284dd59b6c47fc5a9a1bde%7C0%7C1%7C636930132639163595&sdata=6euR5Q4YjKQ7tBVg4ageeYyi2PSno8dqPQsm%2BuvhRKQ%3D&reserved=0" target="_blank">https://slate.com/technology/2019/05/japanese-knotweed-invasive-plants.html</a><u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">And two questions for possible discussion:<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">1. Do MAIPC listserv readers find JK as hard to kill as described in the article?<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">2. I have seen isolated plants come up in some odd places. Does anyone know whether there is any evidence of JK spreading by seeds in our mid-Atlantic area?<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Cheers, Steve Young, Arlington VA volunteer<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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