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

Tue Mar 7 05:48:49 PST 2017

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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> 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>
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> 
> 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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