[APWG] Heavy use of herbicide Roundup linked tohealthdangers:study

[Wayne Tyson]

Seems right to me, as far as it goes. But we have brains to think with--the regs are something else. Observe, observe, observe! 

WT
  ----- Original Message ----- 
  From: John 
  Cc: apwg at lists.plantconservation.org 
  Sent: Tuesday, May 14, 2013 6:00 AM
  Subject: Re: [APWG] Heavy use of herbicide Roundup linked tohealthdangers:study


  The patent  on Round-up has run out, years ago.  There is no reason for using the name brand stuff.  It is usually twice the price or more!


  You may purchase generic glyphosate with zero surfactant.  This is the formulation approved for use on bodies of water.  You may use without surfactant or you may add the surfactant of your choice  If you add your own surfactant, and it has not been tested, you will need to do your own tests of toxicity.


  The word "toxicity" is defined by federal law when used in conjunction with pesticides (herbicides).  The following article has a bit of information about how levels of toxicity are determined, and how you can read pesticide labels to understand the words used.  In all cases, it is the "active" ingredient that is tested because this is the way the federal law is written.


  http://smith.agrilife.org/files/2011/06/pesticide_toxicity_3.pdf




  jb




  On May 13, 2013, at 10:29 AM, Gena Fleming wrote:


    Thank you for that information, Marc.  I can not find an MSDS  on Roundup Classic.  Has it been discontinued?

    Signal words are used as a rudimentary ranking system for acute toxicity.  Environmental data concerns are generally addressed in a different section.  You describe Roundup Pro as "harmless" to amphibians, but the article you attach simply says it is "not lethal", which is not the same thing.

    It is hard to discuss any of this in a meaningful way when surfactants are not disclosed on the product label.  This document is the best information I have been able to retrieve so far and concluding statements are pasted below:
    http://www.fs.fed.us/foresthealth/pesticide/pdfs/Surfactants.pdf


    Comparable data allowing for an assessment of the joint action of glyphosate with the
    surfactant used in Roundup Pro are not available. The surfactant used in Roundup Pro is a
    phosphate ester neutralized polyethoxylated tallow amine (Monsanto 1996) that is probably
    similar to the polyethoxylated tallow amine used in Roundup. Consequently, it is reasonable to
    assume that the surfactant in Roundup Pro will enhance the toxicity of glyphosate to aquatic
    species.

    best,
    Gena




    On Fri, May 10, 2013 at 6:24 AM, Marc Imlay <ialm at erols.com> wrote:

    Hi Gena,

    At M-NCPPC we have switched to Round-up Pro because it is harmless to amphibians according to the web site: 

    http://www.nps.gov/plants/alien/fact/mivi1.htm

    We dilute the 41% concentrate from Lowes by 20 fold and spray to wet.  

    Marc Imlay, PhD,

    Conservation biologist, Park Ranger Office
    Non-native Invasive Plant Control coordinator.
    (301) 442-5657 cell
    ialm at erols.com
    Natural and Historical Resources Division
    The Maryland-National Capital Park and Planning Commission
    www.pgparks.com






    http://www.nps.gov/plants/alien/fact/mivi1.htm

    Microstegium vimineum (Trin.) Camus  
    Grass family (Poaceae)
    <image001.gif>Download PDF version formatted for print (155 KB) 



     Chemical
    For extensive stiltgrass infestations, use of a systemic herbicide such as glyphosate (e.g., Roundup Pro®) is a practical and effective method if used with some caution. Glyphosate is a non-specific herbicide that will kill or damage almost any herbaceous plant and possibly some woody plants it contacts. Roundup Pro® is surfactant-loaded (no additional surfactant needed) and the surfactant is not lethal to amphibians and aquatic invertebrates like the polyoxyethyleneamine surfactant in Roundup Classic® is.  Roundup Pro® carries the 'Caution' signal word while Roundup Classic® carries 'Warning'. When treating stiltgrass in wetland sites, use Rodeo® or other formulation labeled for wetlands. Apply a 2% solution of Roundup® or Rodeo® mixed with water (8 oz. per 3 gals. mix) and a surfactant in late summer. Be careful to avoid application to non-target plants.









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