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<div style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif;"><span style="font-size: 15px;">Good morning Judy,</span></div>
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<div style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif;"><span style="font-size: 15px;">Your fear that rhizomes or other plant pieces could break up and form new infestations in the river is very well justified. This species is notorious for aggressively
spreading to new areas along waterways and floodplains. However, I do not know the salinity range the species can tolerate. <font face="Calibri,sans-serif">My understanding is that Japanese knotweed rarely sets seed, as we discussed at the July meeting of
the Invasive Species Council (MISC). Treating with </font></span><span style="font-size: 15px;">Rodeo is a very good choice for these habitats. </span><font face="Calibri,sans-serif" style="font-size: 15px;">If exclusively treating cut-stump, surfactant wouldn</font><font face="Calibri,sans-serif" style="font-size: 15px;">’t
be added, but if treating foliar, you would add the </font><span style="font-size: 15px;">non-ionic surfactant. Indicator dye would be good to add to ensure all plants are treated, but dye can get messy.</span></div>
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<div style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif;"><span style="font-size: 15px;">A good read from the USDA Natural Resource Conservation Service (NRCS):</span></div>
<div style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif;"><a href="https://efotg.sc.egov.usda.gov/references/public/mn/797japaneseknotweed.pdf" style="font-size: 15px;">https://efotg.sc.egov.usda.gov/references/public/mn/797japaneseknotweed.pdf</a></div>
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<blockquote style="margin: 0px 0px 0px 40px; border: none; padding: 0px;">
<div style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif;"><span style="font-size: 15px;">"Japanese knotweed control should take a watershed perspective, from the headwaters downstream, as the primary dispersal mechanism is by water (both seeds and
plant fragments). Control of knotweed must be well thought out due to the extensive root system and sprouting ability as well as the site limitations. Knotweed frequently infests riparian areas near streams which add complexity to any control plan.”</span></div>
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<div><span style="font-size: 15px;">Pen State also has a great guide: <a href="http://plantscience.psu.edu/research/projects/vegetative-management/publications/roadside-vegetative-mangement-factsheets/5managing-knotweed-on-roadsides">http://plantscience.psu.edu/research/projects/vegetative-management/publications/roadside-vegetative-mangement-factsheets/5managing-knotweed-on-roadsides</a></span></div>
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<div><b style="font-size: 15px;"><font face="Calibri,sans-serif">From the </font><font face="Calibri,sans-serif">Home and Garden Information Center, University of Maryland Extension:</font></b></div>
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<blockquote style="margin: 0px 0px 0px 40px; border: none; padding: 0px;">
<div style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif;"><span style="font-size: 15px;">Japanese Knotweed/Mexican Bamboo (Polygonum cuspidatum) The hollow shoots of this Japanese native have knotty bamboo-like joints. Flowers are greenish-white.
Aggressive roots, 2-3 feet deep, enable it to form exclusive clumps, 6-8 feet tall, in sun or shade. CONTROL: Before late-summer flowering, cut at least 3 times per season and
<u>treat freshly cut stumps and/or foliage with glyphosate</u>. Black plastic mulch will kill.</span></div>
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<div style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif;"><span style="font-size: 15px;">Hopefully a biological control will come at some point…</span></div>
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<div style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif;"><span style="font-size: 15px;">Take care,</span></div>
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<p class="MsoNormal"><span style="font-family: Calibri, sans-serif; font-size: 15px;">Michael Ellis</span></p>
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<p class="MsoNormal"><span style="font-family: Calibri, sans-serif; font-size: 15px;">Non-Native Invasive Plant Management Field Coordinator<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size: 15px;"><span style="font-family: Calibri, sans-serif;">Park Ranger Office, </span><span style="font-family: Calibri, sans-serif;">Natural and Historical Resources Division<o:p></o:p></span></span></p>
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<p class="MsoNormal"><span style="font-family: Calibri, sans-serif; font-size: 15px;">The Maryland-National Capital Park and Planning Commission</span></p>
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<p class="MsoNormal"><span style="font-family: Calibri, sans-serif; font-size: 15px;"> </span></p>
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<p class="MsoNormal"><span style="font-family: Calibri, sans-serif; font-size: 15px;">240-429-5042</span></p>
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<span style="font-weight:bold">From: </span>MAIPC <<a href="mailto:maipc-bounces@lists.maipc.org">maipc-bounces@lists.maipc.org</a>> on behalf of Marc Imlay <<a href="mailto:ialm@erols.com">ialm@erols.com</a>><br>
<span style="font-weight:bold">Date: </span>Saturday, September 3, 2016 at 7:51 AM<br>
<span style="font-weight:bold">To: </span>Judy Fulton <<a href="mailto:jfulton5@GMAIL.COM">jfulton5@GMAIL.COM</a>>, 'MAIPC' <<a href="mailto:maipc@lists.maipc.org">maipc@lists.maipc.org</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [MAIPC] Fallopia japonica<br>
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<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#1F497D">We apply rodeo plus non-ionic surfactant in the little cup that forms at the base when sawed their at ground level. We use 20% glyphosate. We get 100% success with this method.
<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#1F497D"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:red">Marc Imlay, PhD, Chair, MAIPC Biological control working Group Conservation biologist, </span></b><span style="color:windowtext"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:red">Park Ranger Office, Non-native Invasive Plant Control coordinator. </span></b><span style="font-family:"Arial",sans-serif;color:red"><a href="mailto:Marc.Imlay@pgparks.com"><b><span style="color:red;text-decoration:none">Marc.Imlay@pgparks.com</span></b></a></span><span style="color:windowtext"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:red">(301) 442-5657 cell Natural and Historical Resources Division</span></b><span style="color:windowtext"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:red">The Maryland-National Capital Park and Planning Commission</span></b><span style="color:windowtext"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"> MAIPC [<a href="mailto:maipc-bounces@lists.maipc.org">mailto:maipc-bounces@lists.maipc.org</a>]
<b>On Behalf Of </b>Judy Fulton<br>
<b>Sent:</b> Friday, September 02, 2016 12:00 PM<br>
<b>To:</b> MAIPC <<a href="mailto:maipc@lists.maipc.org">maipc@lists.maipc.org</a>><br>
<b>Subject:</b> [MAIPC] Fallopia japonica<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p><span style="font-family:"Helvetica",sans-serif">I was recently sent the attached two photos of what looks like Fallopia japonica (aka Polygonum cuspidatum and Reynoutria japonica), which were taken in May. Apparently, the homeowners, whose property borders
Back River in Baltimore County near Rock Creek Park, Maryland, are quite pleased with their decision to plant “Japanese bamboo” to reduce erosion.<br>
<br>
I’m concerned because Fallopia japonica can live in salt environments, such as salt marshes. I’ve been informed that the mouth of Back River is at the southern edge of the fresh water zone of the Chesapeake Bay with average salinity of 6 ppt, but salinity can
range from <1 ppt to 10 ppt depending on weather conditions. I’m assuming that the pieces of rhizomes that might break off in a major storm could survive in Back River to colonize other areas, especially if the storm reduced the salinity in the river. Does
anyone know if this is correct? Also, would the seeds remain viable if they were transported to another location by Back River?<br>
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If the homeowners were convinced to remove their Fallopia japonica, what would be the best way to eradicate it so near the water? Something like Rodeo plus a non-ionic surfactant?
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Thanks for your advice. <br>
<br>
Judy</span><o:p></o:p></p>
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<p class="MsoNormal">____________________________________________<br>
<br>
Judith P. Fulton<br>
Consultant, University of Maryland Extension<br>
Master Gardener, University of Maryland Extension<br>
Chair, Maryland Invasive Species Council Subcommittee on Invasives Lists<br>
410-337-3701<br>
<a href="mailto:jfulton5@gmail.com">jfulton5@gmail.com</a><o:p></o:p></p>
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