Japanese Knotweed

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0> <table cellpadding=0 cellspacing=0 border=0><tr> <td valign="top" colspan=2 height=110 BGCOLOR="#000000" TEXT="#F7F7FF" bgproperties="fixed" background="0b200b00dvldtc.jpg"> <bR> <div> <FONT SIZE="6" COLOR="#FFFFFF" FACE="Arial" ><B>Driftless Land Stewardship LLC</B></FONT><FONT SIZE="1" COLOR="#FFFFCC" FACE="Arial" ><B>    </B></FONT><B> |   </B><A HREF="index.htm" TARGET="_top" TITLE="Driftless Land Stewardship LLC"><U><B>Home</B></U></A><B> </B></div> <div> <A HREF="id23.htm" TARGET="_top" TITLE="Invasive Species Control"><U>Invasive Species Control</U></A></div> <div> </div> </td> </tr><tr> <td valign="top" width=190 BGCOLOR="#CCCC99" TEXT="#080000" background="043bec00esnpes.png"> <div> <A HREF="id74.htm" TARGET="_top" TITLE="Garlic Mustard"><U><B>Garlic Mustard</B></U></A></div> <div> <A HREF="id31.htm" TARGET="_top" TITLE="Autumn Olive"><U><B>Autumn Olive</B></U></A></div> <div> <A HREF="id28.htm" TARGET="_top" TITLE="Crown Vetch"><U><B>Crown Vetch</B></U></A></div> <div> <A HREF="id38.htm" TARGET="_top" TITLE="Exotic Honeysuckles"><U><B>Exotic Honeysuckles</B></U></A></div> <div> <A HREF="id39.htm" TARGET="_top" TITLE="Multiflora Rose"><U><B>Multiflora Rose</B></U></A></div> <div> <A HREF="id40.htm" TARGET="_top" TITLE="Aspen"><U><B>Aspen</B></U></A></div> <div> <A HREF="id41.htm" TARGET="_top" TITLE="Reed Canary Grass"><U><B>Reed Canary Grass</B></U></A></div> <div> <A HREF="id42.htm" TARGET="_top" TITLE="Wild Parsnip"><U><B>Wild Parsnip</B></U></A></div> <div> <A HREF="id43.htm" TARGET="_top" TITLE="Buckthorns"><U><B>Buckthorns</B></U></A></div> <div> <A HREF="id44.htm" TARGET="_top" TITLE="Purple Loosestrife"><U><B>Purple Loosestrife</B></U></A></div> <div> <A HREF="id45.htm" TARGET="_top" TITLE="Spotted Knapweed"><U><B>Spotted Knapweed</B></U></A></div> <div> <A HREF="id59.htm" TARGET="_top" TITLE="Black Locust"><U><B>Black Locust</B></U></A></div> <div> <B>Japanese Knotweed</B></div> <div> <A HREF="id61.htm" TARGET="_top" TITLE="Leafy Spurge"><U><B>Leafy Spurge</B></U></A></div> </td> <td valign="top" height=370 BGCOLOR="#FFFFFF" TEXT="#080000"> <div> Japanese Knotweed</div> <div> <I>Polygonum cuspidatum</I> </div> <bR> <div> Origin: Non-native</div> <div> Distribution and Commonness: wide-spread, common</div> <div> Habitat: especially problematic in moist soils, full-sun to moderate shade </div> <div> Growth Form: clonal shrub</div> <div> Common Vector: waterflow, suckering </div> <bR> <div> Notes:  Control practices often cause suckering. Very difficult to control without considerable damage to natural community. DLS has achieved 100% control using Imazapyr.</div> <bR> <div> Additional control practices:</div> <div> Chemical: Typical herbicides have limited effectiveness. foliar, basal bark, wick</div> <div> Mechanical: forestry mower, light mower, brushcutter</div> <div> Rx fire: seedlings highly susceptible, limited negative impact to adults</div> <bR> <bR> <div> <A HREF="http://tncweeds.ucdavis.edu/esadocs/documnts/polycus.html" TARGET="_top" TITLE="http://tncweeds.ucdavis.edu/esadocs/docu"><U> TNC Element Stewardship Abstract</U></A></div> <bR> <div> <A HREF="http://www.co.clark.wa.us/environ/Knotweed.pdf" TARGET="_top" TITLE="http://www.co.clark.wa.us/environ/Knotwe"><U>Clark Co., WA</U></A></div> <bR> <div> <A HREF="http://www.ecy.wa.gov/programs/wq/plants/weeds/aqua015.html" TARGET="_top" TITLE="http://www.ecy.wa.gov/programs/wq/plants"><U>Washington State Department of Ecology</U></A></div> </td> </tr></table></body>