[APWG] Heavy use of herbicide Roundup linked tohealth dangers:study

[Gena Fleming]

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

*Microstegium vimineum* (Trin.) Camus
Grass family (Poaceae)
[image: Adobe Acrobat Reader]Download PDF version formatted for
print<http://www.nps.gov/plants/alien/fact/pdf/mivi1.pdf>(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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