<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Mar 7, 2017, at 8:48 AM, Kathryn Peterson-Lambert <<a href="mailto:triplam747@aol.com" class="">triplam747@aol.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hello and great point regarding chemical resistance - this is a biological process that is present everywhere - in my IPM classes that I had with Mark and also in Pennsylvania - it was suggested that rotating the use of chemicals would alleviate some of this resistance - it is similar to the antibiotic resistance that humans develop to bacteria - using the products correctly and not abusing them also helps - much like the IPM - Mark suggested using a lower dosage on the conservative side to treat problems - rather than too much. This combined with a rotation of chemicals and without a sole reliance on the chemicals. Mechanical, biological, other methods are available - once a chemical has not been used for three years or so - then the plants after so many generations of growth may respond to the chemical again. <br class=""><div style="direction: ltr;" class=""><blockquote type="cite" class=""><div class="">On Mar 6, 2017, at 4:43 PM, <a href="mailto:maipc-request@lists.maipc.org" class="">maipc-request@lists.maipc.org</a> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Send MAIPC mailing list submissions to<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span><a href="mailto:maipc@lists.maipc.org" class="">maipc@lists.maipc.org</a><br class=""><br class="">To subscribe or unsubscribe via the World Wide Web, visit<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>http://lists.maipc.org/listinfo.cgi/maipc-maipc.org<br class="">or, via email, send a message with subject or body 'help' to<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>maipc-request@lists.maipc.org<br class=""><br class="">You can reach the person managing the list at<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>maipc-owner@lists.maipc.org<br class=""><br class="">When replying, please edit your Subject line so it is more specific<br class="">than "Re: Contents of MAIPC digest..."<br class=""><br class=""><br class="">Today's Topics:<br class=""><br class=""> 1. 2 upcoming meetings + Faith's blog about inv spp intro rates<br class=""> (Phytodoer@aol.com)<br class=""> 2. Invasive Management as a Selection Pressure (frazmo)<br class=""><br class=""><br class="">----------------------------------------------------------------------<br class=""><br class="">Message: 1<br class="">Date: Mon, 6 Mar 2017 11:03:43 -0500<br class="">From: Phytodoer@aol.com<br class="">To: necis@lists.nationalwildlife.org, ficmnew@ls.ars.usda.gov,<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>maipc@lists.maipc.org<br class="">Subject: [MAIPC] 2 upcoming meetings + Faith's blog about inv spp<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>intro rates<br class="">Message-ID: <1983feb.235d5b14.45eee25e@aol.com><br class="">Content-Type: text/plain; charset="utf-8"<br class=""><br class="">Hello,<br class="">forest pest mavens & others<br class=""><br class="">I have posted a blog at _www.cisp.us_ (http://www.cisp.us) or <br class="">_www.nivemnic.us_ (http://www.nivemnic.us) that reports on the Hanno Seebens & 40+ <br class="">colleagues - showing that introductions of invasive species continued to rise <br class="">in the 20th Century & first years of the 21st ... policies are not yet <br class="">adequately effective in turning back this tidal wave ...<br class=""><br class="">2 meetings in May provide opportunity to join others working on these <br class="">problems. <br class=""><br class="">1) The North American Invasive Species Forum - which meets every other year <br class=""> - is meeting in Savannah, GA on May 9 - 11. I hope this meeting will help <br class=""> bridge the gap between "invasive species" activists and official <br class="">"phytosanitary" types. The agenda and registration information is at <br class="">http://www.invasivespecies2017.org/<br class=""><br class="">2) IUFRO section on Foliage, shoot and stem diseases of forest trees will <br class="">be in Niagara Falls, Ontario on May 7-11, 2017. This year?s meeting theme: <br class="">Invasive Forest Pathogens & Implications for Biology and Policy. Details <br class="">are at https://www.cif-ifc.org/iufroworkingparty2017/<br class=""><br class="">Wish I could go to both!<br class=""><br class="">Faith Campbell<br class="">-------------- next part --------------<br class="">An HTML attachment was scrubbed...<br class="">URL: <http://lists.maipc.org/pipermail/maipc-maipc.org/attachments/20170306/f30715ea/attachment.html><br class=""><br class="">------------------------------<br class=""><br class="">Message: 2<br class="">Date: Mon, 6 Mar 2017 15:09:38 -0500<br class="">From: frazmo <frazmo@gmail.com><br class="">To: "maipc@lists.maipc.org" <maipc@lists.maipc.org><br class="">Subject: [MAIPC] Invasive Management as a Selection Pressure<br class="">Message-ID:<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span><CAOO+nP-_XmaoR=nJmKOdZxuS+nhuxZfjwa9o0KjQg1EW7iRKJw@mail.gmail.com><br class="">Content-Type: text/plain; charset="utf-8"<br class=""><br class="">It?s well known that pesticide use can cause the development of chemical<br class="">resistance in target insects and plants. Based on anecdotal information and<br class="">personal observations, non-chemical invasive plant control efforts appear<br class="">to be able to cause the development of ?resistance-like? adaptations in<br class="">plants. When we engage in sustained management activity on an invasive<br class="">plant at a site, we can create selection pressure on the plant. Unwittingly<br class="">we may serve like plant breeders trying to create desirable new varieties,<br class="">but creating undesirable new varieties that could become more challenging<br class="">to manage.<br class=""><br class="">Several examples. These are based on anecdotes and personal observations,<br class="">and I am hoping that perhaps some folks will be inspired to gather data and<br class="">study this more closely. When Japanese Stiltgrass invades a frequently<br class="">mowed area like a managed lawn, I have seen reports that it adapts to<br class="">flower and set seed even in the face of the mowing. I have noted that as we<br class="">have intensified efforts to control Garlic Mustard by hand pulling, it may<br class="">be adapting by flowering and developing viable seed earlier, in advance of<br class="">when we have tended to focus our pulling efforts. (I realize that a<br class="">confounding factor here is our increasing warming trend.) Also, I think I?m<br class="">seeing signs that we are selecting out the tallest, most robust plants, and<br class="">seeing more ?stunted? plants that may be harder to spot, yet still produce<br class="">seeds. Upper parts of plants may detach more readily leaving viable roots<br class="">behind, and un-pulled plants may have a second bloom later in the season.<br class=""><br class="">Finally, over twenty-plus years of pulling English Ivy at Long Branch<br class="">Nature Center in Arlington, Virginia, I have noticed recently that more of<br class="">the remaining ivy seems to have a new characteristic. The vines seem to be<br class="">more fragile. Before, most vines pulled up very cooperatively, leaving few<br class="">rooted stem fragments. Now I find more uncooperative vines that go to<br class="">pieces on me, creating more work to find and pull all the viable remnants.<br class="">I believe that we?ve inadvertently selected for this trait.<br class=""><br class="">In closing, my key point is that we in the invasive plants community should<br class="">be conscious of the possibility that we are selecting for resistant traits.<br class="">We should monitor for signs and consider changing up our practices<br class="">occasionally to reduce the risk of developing non-chemical resistance.<br class=""><br class="">Cheers,<br class=""><br class="">Steve Young, Volunteer, Arlington VA (past MAIPC Treasurer)<br class="">-------------- next part --------------<br class="">An HTML attachment was scrubbed...<br class="">URL: <http://lists.maipc.org/pipermail/maipc-maipc.org/attachments/20170306/68d7c869/attachment-0001.htm><br class=""><br class="">------------------------------<br class=""><br class="">Subject: Digest Footer<br class=""><br class="">_______________________________________________<br class="">MAIPC mailing list<br class="">MAIPC@lists.maipc.org<br class="">http://lists.maipc.org/listinfo.cgi/maipc-maipc.org<br class=""><br class=""><br class="">------------------------------<br class=""><br class="">End of MAIPC Digest, Vol 65, Issue 3<br class="">************************************<br class=""></div></div></blockquote></div><br class=""></div></div></blockquote></div><br class=""></body></html>