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Damien<br>
<br>
Very prescient timing. I am just now reading "The Hidden Half of
Nature" which is a good presentation of soil ecology for the layman.<br>
<br>
I am impressed by the interaction among bacteria, fungi and plants
in the rhizosphere of plant roots. The discussion of how the
agrichemical culture disrupts the effectiveness of microbe ecology
(reducing the beneficial microbes that consume plant exudates thus
allowing the pathogenic microbes to dominate) is pretty convincing.<br>
<br>
While this is not a definitive argument against glyphosate, it does
give some credence to the premise of those concerned. <br>
<br>
The counter argument of course is that we have used glyphosate for
years to manage invasive species and the soil ecology seems to
recover. Also, I would weigh the relative risks of allowing
invasives to take over (with the resulting impact of THEIR exudates
on the soil ecology) vs. keeping them at bay and maintaining the
soil ecology that is decided that "should" be there.<br>
<br>
I really think the issue is the long term relative risk of non
treatment vs. treatment. Even if there are definitive data to
demonstrate that glyphosate harms the soil ecology, what is that
impact relative to allowing a monoculture of stiltgrass (or WLBG)
develop? We KNOW (I think?) these invasives have extensive and long
term impacts on soil ecology.<br>
<br>
Kind of like oral contraceptives. We know there are risks
associated with their use. But, those risks are minuscule compared
to the risks associated with pregnancy and child birth. (used to
work in maternal health).<br>
<br>
Will follow this discussion with interest! Thanks for bringing it
up.<br>
<pre class="moz-signature" cols="72">Regards,
Dewey Clark
Club Naturalist
Co-District Manager (PA)
Potomac Appalachian Trail Club
Maryland Master Naturalist</pre>
<div class="moz-cite-prefix">On 10/18/2017 9:17 AM, Ossi, Damien
(DOEE) wrote:<br>
</div>
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<p class="MsoNormal">I am trying to convince the land managers
in my city (Greenbelt, MD) to start managing the invasive
plants on some of their land. I am getting some pushback from
a community group that says there’s proof that glyphosate will
kill or damage trees and soil biota. I’ve been looking for
published papers that would support of refute their arguments,
but have been unable to find much. (I don’t have access to
JSTOR, BioOne, etc.)
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">They are citing the following documents: <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">(1) Pennsylvania Extension Service: Tree
roots absorb glyphosate; it has a much longer half-life than
when it is in the soil. A single glyphosate application
results in ,persistent stunted leaf growth.
<a
href="https://extension.psu.edu/use-glyphosate-with-care-near-trees"
target="_blank" moz-do-not-send="true">
https://extension.psu.edu/use-glyphosate-with-care-near-trees</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">(2) Michigan Extension Service: Herbicides
that touch the bark of mature, healthy trees may be absorbed
by the outer bark and negatively affect the adjacent vascular
tissue.
<a
href="http://msue.anr.msu.edu/news/be_careful_where_you_spray_that_stuff"
target="_blank" moz-do-not-send="true">
http://msue.anr.msu.edu/news/be_careful_where_you_spray_that_stuff</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">(3) Glyphosate interferes with the ability
of tree roots to absorb manganese, zinc, iron, and boron from
the soil; resulting in root rot, reduced cold hardiness, and
reduced drought hardiness.
<a
href="http://homeguides.sfgate.com/effect-glyphosate-tree-roots-29076.html"
target="_blank" moz-do-not-send="true">
http://homeguides.sfgate.com/effect-glyphosate-tree-roots-29076.html</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Does anyone have any resources that address
these issues, or is there any known comprehensive document
that reviews and summarizes independent research on the
effects on glyphosate in forest ecosystems?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Damien<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt">Damien P.
Ossi<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Wildlife
Biologist<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Fisheries
and Wildlife Division<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Department
of Energy & Environment<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Government
of the District of Columbia<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">1200 First
Street NE, 5th Floor<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Washington,
DC 20002<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Desk: (202)
741-0840<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Web: <a
href="http://www.doee.dc.gov/" moz-do-not-send="true">
<span style="color:blue">doee.dc.gov</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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