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Andrea,<br>
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You've given me some useful information. I haven't seen Reynoutria
x bohemica in the wild that I know of, but I've heard that it's
hard to distinguish from R. japonica. I also find it somewhat
difficult to ID plants from pictures, and the photo<tt>s t</tt>hat
were sent<tt> t</tt>o me don't show much detail. My understanding
is that the easiest characteristic for distinguishing among R.
japonica, sachalinensis and x bohemica are the hairs along the
veins on the leaf undersides, but those hairs aren't visible in
the photos (see Flora of North America:
<a class="moz-txt-link-freetext" href="http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250060601">http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250060601</a>
and Weakley's Flora of the Southern and Mid-Atlantic States, page
800: <a class="moz-txt-link-freetext" href="http://www.herbarium.unc.edu/flora.htm">http://www.herbarium.unc.edu/flora.htm</a>). <br>
<br>
I thought that the plants in the photos appeared to have leaves in
the size-range for R. japonica; however, it's conceivable that
they are bigger. (In the close-up photo it's hard to compare leaf
size to what I assume is a 4 x 4 upright or to the boards on the
deck because of foreshortening. I ended up trying to look at the
leaf shadows against the boards to determine size.)<br>
<br>
How sure are you that the plants in the photos are Reynoutria x
bohemica? What are the specific leaf size and shape
characteristics that you are using to distinguish between R.
japonica and x bohemica? Weakley's Flora of the Southern and
Mid-Atlantic States says that R. x bohemia has "mid-branch leaf
bases usually slightly cordate", whereas R. japonica has
"mid-branch leaves truncate (to very broadly V-shaped)". I can
make an argument that the mid-branch leaves in the close-up photo
look slightly cordate, but I'm not sure, and there are plenty of
similar leaf shapes online that are attributed to R. japonica. Can
you recommend a key with a more definitive description that I can
use in the future? I'm planning to collect samples of some
knotweed near me to key it out and see whether it's japonica or x
bohemica.<br>
<br>
Thanks again,<br>
Judy<br>
____________________________________________<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 class="moz-txt-link-abbreviated" href="mailto:jfulton5@gmail.com">jfulton5@gmail.com</a><br>
<br>
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<div class="moz-cite-prefix">On 9/6/2016 11:35 AM, Locke, Andrea S
wrote:<br>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">In
addition to the methods provided, I’ve found success using
stem-injection with glyphosate, especially for areas
adjacent to water. My understanding is also that japanese
knotweed (<i>Reynoutria japonica</i>) doesn’t produce viable
seed, however giant knotweed (<i>R. sachalinensis</i>) and
the hybrid bohemian knotweed <i>(R. x bohemica</i>) do.
Looking at the photographs provided, this is probably
bohemian, not japanese. Leaf size and shape are good
characteristics to use for differentiation. In my area,
bohemian is the most common knotweed, by far. <o:p></o:p></span></p>
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style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></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"><span
style="font-size:11.0pt;font-family:"Lucida
Handwriting";color:#1F497D">Andrea Locke<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">WNY
PRISM Coordinator<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">716.878.4708<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><a class="moz-txt-link-abbreviated" href="mailto:lockeas@buffalostate.edu">lockeas@buffalostate.edu</a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><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 class="moz-txt-link-freetext" 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 2, 2016 12:00 PM<br>
<b>To:</b> MAIPC <a class="moz-txt-link-rfc2396E" 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>
<br>
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? <br>
<br>
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 moz-do-not-send="true" href="mailto:jfulton5@gmail.com">jfulton5@gmail.com</a><o:p></o:p></p>
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