[MAIPC] MAIPC Digest, Vol 65, Issue 3 -Message 2

Thu Mar 9 11:12:43 PST 2017

> On Mar 7, 2017, at 8:48 AM, Kathryn Peterson-Lambert <triplam747 at aol.com> wrote:
> 
> 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. 
>> On Mar 6, 2017, at 4:43 PM, maipc-request at lists.maipc.org wrote:
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>> Today's Topics:
>> 
>>   1. 2 upcoming meetings + Faith's blog about inv spp intro rates
>>      (Phytodoer at aol.com)
>>   2. Invasive Management as a Selection Pressure (frazmo)
>> 
>> 
>> ----------------------------------------------------------------------
>> 
>> Message: 1
>> Date: Mon, 6 Mar 2017 11:03:43 -0500
>> From: Phytodoer at aol.com
>> To: necis at lists.nationalwildlife.org, ficmnew at ls.ars.usda.gov,
>> 	maipc at lists.maipc.org
>> Subject: [MAIPC] 2 upcoming meetings + Faith's blog about inv spp
>> 	intro rates
>> Message-ID: <1983feb.235d5b14.45eee25e at aol.com>
>> Content-Type: text/plain; charset="utf-8"
>> 
>> Hello,
>> forest pest mavens & others
>> 
>> I have posted a blog at _www.cisp.us_ (http://www.cisp.us)  or 
>> _www.nivemnic.us_ (http://www.nivemnic.us)  that reports on the Hanno  Seebens & 40+ 
>> colleagues - showing that introductions of invasive species  continued to rise 
>> in the 20th Century & first years of the 21st ... policies  are not yet 
>> adequately effective in turning back this tidal wave ...
>> 
>> 2 meetings in May provide opportunity to join others working on these  
>> problems.  
>> 
>> 1) The North American Invasive Species Forum - which meets every other year 
>> - is meeting in Savannah, GA on May 9 - 11.  I hope this meeting will help 
>> bridge the gap between "invasive species" activists and official 
>> "phytosanitary"  types.  The agenda and registration information is at 
>> http://www.invasivespecies2017.org/
>> 
>> 2) IUFRO section on Foliage, shoot and stem diseases of forest trees will  
>> be in Niagara Falls, Ontario on May 7-11, 2017. This year?s meeting  theme: 
>> Invasive Forest Pathogens & Implications for Biology and  Policy. Details 
>> are at https://www.cif-ifc.org/iufroworkingparty2017/
>> 
>> Wish I could go to both!
>> 
>> Faith Campbell
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>> ------------------------------
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>> Message: 2
>> Date: Mon, 6 Mar 2017 15:09:38 -0500
>> From: frazmo <frazmo at gmail.com>
>> To: "maipc at lists.maipc.org" <maipc at lists.maipc.org>
>> Subject: [MAIPC] Invasive Management as a Selection Pressure
>> Message-ID:
>> 	<CAOO+nP-_XmaoR=nJmKOdZxuS+nhuxZfjwa9o0KjQg1EW7iRKJw at mail.gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>> 
>> It?s well known that pesticide use can cause the development of chemical
>> resistance in target insects and plants. Based on anecdotal information and
>> personal observations, non-chemical invasive plant control efforts appear
>> to be able to cause the development of ?resistance-like? adaptations in
>> plants. When we engage in sustained management activity on an invasive
>> plant at a site, we can create selection pressure on the plant. Unwittingly
>> we may serve like plant breeders trying to create desirable new varieties,
>> but creating undesirable new varieties that could become more challenging
>> to manage.
>> 
>> Several examples. These are based on anecdotes and personal observations,
>> and I am hoping that perhaps some folks will be inspired to gather data and
>> study this more closely. When Japanese Stiltgrass invades a frequently
>> mowed area like a managed lawn, I have seen reports that it adapts to
>> flower and set seed even in the face of the mowing. I have noted that as we
>> have intensified efforts to control Garlic Mustard by hand pulling, it may
>> be adapting by flowering and developing viable seed earlier, in advance of
>> when we have tended to focus our pulling efforts. (I realize that a
>> confounding factor here is our increasing warming trend.) Also, I think I?m
>> seeing signs that we are selecting out the tallest, most robust plants, and
>> seeing more ?stunted? plants that may be harder to spot, yet still produce
>> seeds. Upper parts of plants may detach more readily leaving viable roots
>> behind, and un-pulled plants may have a second bloom later in the season.
>> 
>> Finally, over twenty-plus years of pulling English Ivy at Long Branch
>> Nature Center in Arlington, Virginia, I have noticed recently that more of
>> the remaining ivy seems to have a new characteristic. The vines seem to be
>> more fragile. Before, most vines pulled up very cooperatively, leaving few
>> rooted stem fragments. Now I find more uncooperative vines that go to
>> pieces on me, creating more work to find and pull all the viable remnants.
>> I believe that we?ve inadvertently selected for this trait.
>> 
>> In closing, my key point is that we in the invasive plants community should
>> be conscious of the possibility that we are selecting for resistant traits.
>> We should monitor for signs and consider changing up our practices
>> occasionally to reduce the risk of developing non-chemical resistance.
>> 
>> Cheers,
>> 
>> Steve Young, Volunteer, Arlington VA (past MAIPC Treasurer)
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>> End of MAIPC Digest, Vol 65, Issue 3
>> ************************************
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