[APWG] [Aliens-L] Re: high mortality of frogs with Roundup?

[Marc Imlay]

----- Original Message -----
From: "Rick Roush" <rtroush at ucdavis.edu>
To: <aliens-l at indaba.iucn.org>
Sent: Tuesday, April 12, 2005 12:54 AM
Subject: [Aliens-L] Re: high mortality of frogs with Roundup?


Dear All:

In addition to what Don Strong and Jonathan Newman have already written,
several of us have calculated that the rates of Roundup used in the paper
are 7 times field rate.  Further, all Roundup products have a precaution
that states "Do not apply directly to water, to areas where water is present
or intertidal areas below the mean high water mark."

I am not so naive as to believe that everyone follows the label, but I
suspect that it is not so common that people accidentally apply 7 times the
field rate to ponds and streams.  The other side of the coin is what are the
alternatives?  Glyphosate products are probably still among the most benign
herbicides if you have to use one, and is probably less damaging to habitats
than erosion from tillage for weed management, and is less damaging than
invasive weeds.

Save the frogs but lose the bog?   Probably better is to remind people to
use the aquatic formulations near water, and press ag users to be careful.

Rick


On Friday, April 8, 2005 3:47 PM, Don Strong <drstrong at ucdavis.edu> wrote:

Dear Aliens List:

Pertinent to the earlier posting about the toxicity of
Roundup, please see highlighted final lines from the paragraph
on pg. 619 of ,

THE IMPACT OF INSECTICIDES AND HERBICIDES ON THE
BIODIVERSITY AND PRODUCTIVITY OF AQUATIC COMMUNITIES
RICK A. RELYEA
Ecological Applications, 15(2), 2005, pp. 618-627
q 2005 by the Ecological Society of America

'Tis important to distinguish "Rodeo," the glyphosate formulation
registered for use in some aquatic and intertidal areas from
Roundup.

Look at the difference in toxicity between Rodeo and Roundup,
in the paragraph below.

 Don

These studies suggest that the high mortality associated with
commercial forms of Roundup is actually due to the POEA
surfactant and not to glyphosate itself. "

............................................................................
..........................................
 Donald R. Strong
 Professor
 Section of Ecology and Evolution, UC Davis

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