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Date:         Sat, 23 Jul 2011 15:49:07 -0500
Reply-To:     Caroline Dieterle <[log in to unmask]>
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From:         Caroline Dieterle <[log in to unmask]>
Subject: [IOWA-NATIVE-PLANTS] Fwd: Re: Resistant weeds leave farmers desperate
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>>
>>This is just out from Iowa State University weed scientists. 
>>Apparently the best option they can come up with for controlling 
>>glyphosate-resistant weeds is cultivation.
>
>Ah -- the same conclusion some of us came to a LONG time ago...
>
>
>>
>>
>>Managing Glyphosate Failures
>>
>>By Bob Hartzler and Mike Owen, Department of Agronomy, Iowa State University
>>
>>In the past week we have received numerous calls from farmers, 
>>agchem dealers and industry representatives regarding waterhemp and 
>>horseweed/marestail surviving glyphosate applications made in late 
>>June and early July. Although there are numerous reasons why a 
>>herbicide application might fail at controlling weeds, we are 
>>certain that a significant percentage of these failures are due to 
>>the presence of glyphosate-resistant biotypes in the field.
>>
>>The common question is what can be done to rescue the situation in 
>>the field. Unfortunately, at this time of the year there are few 
>>options.
>>If glyphosate failed earlier to control the weeds, it is unlikely 
>>that a repeat application will do any good in controlling the 
>>surviving weeds. The PPO inhibitors (Reflex, Cobra, Phoenix, 
>>UltraBlazer, etc.) are the other postemergence option available for 
>>waterhemp in soybean.
>>However, the label restrictions regarding weed size are long past 
>>and thus these herbicides are unlikely to provide affective 
>>control. There also is a potential for serious crop injury with the 
>>high temperature forecast for the coming week.  Furthermore, the 
>>harvest interval restrictions for each of these products should be 
>>reviewed.
>>
>>Although not popular with the majority of growers, mechanical 
>>control is really the only available option to manage escaped 
>>and/or herbicide-resistant waterhemp and horseweed/marestail at 
>>this time. If only scattered plants are present in the field, 
>>hand-weeding the field would be worth the effort since this will 
>>slow the establishment and spread of resistance within the field. 
>>If the presence of surviving waterhemp and horseweed/marestail is 
>>more widespread, a trip back in time using a cultivator is really 
>>the only option to reduce the problems with these escapes.
>>
>>Bob Hartzler and Micheal Owen are professors of agronomy and weed 
>>science extension specialists with responsibilities in weed 
>>management and herbicide use.
>>
>>
>>
>>
>>From: Biotech Forum 
>>[mailto:[log in to unmask]] On Behalf Of 
>>Laurel Hopwood
>>Sent: Monday, July 18, 2011 9:40 AM
>>To: [log in to unmask]
>>Subject: Resistant weeds leave farmers desperate
>>
>>http://www.stltoday.com/business/local/article_f01139be-ace0-502b-944a-0c534b70511c.html#ixzz1SNadASFT
>>Resistant weeds leave farmers desperate
>>St Louis Today, July 17 2011
>>by Georgina Gustin
>>EDITED
>>
>>Weeds are becoming increasingly resistant to Monsanto's Roundup 
>>forcing farmers to use other herbicides or multiple modes of 
>>action. But farmers are finding that these other modes of action 
>>aren't working either - and there appears to be little relief on 
>>the horizon. Farmers are also frustrated  because these additional 
>>herbicides are costing them profits.
>>
>>Critics of the industry point out that Monsanto and its competitors 
>>have known about glyphosate resistance.
>>Brett Lorenzen, a legal analyst with the Environmental Working 
>>Group, stated "It's hard to read a 54-page booklet." 
>>
>>Laurel writes:
>>Monsanto apparently had an aggressive PR campaign to convince 
>>farmers that GM crops would make it easier and cheaper to farm. 
>>It's unfortunate that farmers are now seeing the truth and are 
>>apparently having a difficult time purchasing non GM crops.
>>The quote about the 54 page booklet being "hard to read" is very telling.
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<html><head><style type="text/css"><!--blockquote, dl, ul, ol, li { padding-top: 0 ; padding-bottom: 0 } --></style><title>Fwd: Re: Resistant weeds leave farmers
desperate</title></head><body>
<blockquote type="cite" cite>
<blockquote type="cite" cite><br></blockquote>
<blockquote type="cite" cite><font face="Arial" size="-1" color="#000080">This is just out from Iowa State University weed
scientists.&nbsp; Apparently the best option they can come up with for
controlling glyphosate-resistant weeds is
cultivation.</font></blockquote>
</blockquote>
<blockquote type="cite" cite><br>
Ah -- the same conclusion some of us came to a LONG time
ago...</blockquote>
<blockquote type="cite" cite><br>
<br>
<blockquote type="cite" cite><font face="Arial" size="-1" color="#000080">&nbsp;</font></blockquote>
<blockquote type="cite" cite><font face="Arial" size="-1" color="#000080">&nbsp;</font></blockquote>
<blockquote type="cite" cite><font face="Courier New" size="-1">Managing Glyphosate Failures</font></blockquote>
<blockquote type="cite" cite><font face="Courier New" size="-1">&nbsp;</font></blockquote>
<blockquote type="cite" cite><font face="Courier New" size="-1">By Bob
Hartzler and Mike Owen, Department of Agronomy, Iowa State
University</font></blockquote>
<blockquote type="cite" cite><font face="Courier New" size="-1">&nbsp;</font></blockquote>
<blockquote type="cite" cite><font face="Courier New" size="-1">In the
past week we have received numerous calls from farmers, agchem dealers
and industry representatives regarding waterhemp and
horseweed/marestail surviving glyphosate applications made in late
June and early July. Although there are numerous reasons why a
herbicide application might fail at controlling weeds, we are certain
that a significant percentage of these failures are due to the
presence of glyphosate-resistant biotypes in the
field.</font></blockquote>
<blockquote type="cite" cite><font face="Courier New" size="-1">&nbsp;</font></blockquote>
<blockquote type="cite" cite><font face="Courier New" size="-1">The
common question is what can be done to rescue the situation in the
field. Unfortunately, at this time of the year there are few
options.</font></blockquote>
<blockquote type="cite" cite><font face="Courier New" size="-1">If
glyphosate failed earlier to control the weeds, it is unlikely that a
repeat application will do any good in controlling the surviving
weeds. The PPO inhibitors (Reflex, Cobra, Phoenix, UltraBlazer, etc.)
are the other postemergence option available for waterhemp in
soybean.</font></blockquote>
<blockquote type="cite" cite><font face="Courier New" size="-1">However, the label restrictions regarding weed size are long
past and thus these herbicides are unlikely to provide affective
control. There also is a potential for serious crop injury with the
high temperature forecast for the coming week.&nbsp; Furthermore, the
harvest interval restrictions for each of these products should be
reviewed.</font></blockquote>
<blockquote type="cite" cite><font face="Courier New" size="-1">&nbsp;</font></blockquote>
<blockquote type="cite" cite><font face="Courier New" size="-1">Although not popular with the majority of growers,
mechanical control is really the only available option to manage
escaped and/or herbicide-resistant waterhemp and horseweed/marestail
at this time. If only scattered plants are present in the field,
hand-weeding the field would be worth the effort since this will slow
the establishment and spread of resistance within the field. If the
presence of surviving waterhemp and horseweed/marestail is more
widespread, a trip back in time using a cultivator is really the only
option to reduce the problems with these escapes.</font></blockquote>
<blockquote type="cite" cite><font face="Courier New" size="-1">&nbsp;</font></blockquote>
<blockquote type="cite" cite><font face="Courier New" size="-1">Bob
Hartzler and Micheal Owen are professors of agronomy and weed science
extension specialists with responsibilities in weed management and
herbicide use.</font></blockquote>
<blockquote type="cite" cite><font face="Courier New" size="-1">&nbsp;</font></blockquote>
<blockquote type="cite" cite><font face="Arial" size="-1" color="#000080">&nbsp;</font></blockquote>
<blockquote type="cite" cite><font face="Arial" size="-1" color="#000080">&nbsp;</font></blockquote>
<blockquote type="cite" cite>
<hr size="2"></blockquote>
<blockquote type="cite" cite><font face="Tahoma" size="-1"><b>From:</b> Biotech Forum
[mailto:[log in to unmask]]<b> On Behalf
Of</b> Laurel Hopwood<br>
<b>Sent:</b> Monday, July 18, 2011 9:40 AM<br>
<b>To:</b> [log in to unmask]<br>
<b>Subject:</b> Resistant weeds leave farmers
desperate</font></blockquote>
<blockquote type="cite" cite><font face="Times New Roman">&nbsp;</font></blockquote>
<blockquote type="cite" cite><font face="Arial" >http://www.stltoday.com/business/local/article_f01139be-ace0-502b-94<span ></span>4a-0c534b70511c.html#ixzz1SNadASFT<br>
Resistant weeds leave farmers desperate<br>
St Louis Today, July 17 2011<br>
by Georgina Gustin<br>
EDITED<br>
<br>
Weeds are becoming increasingly resistant to Monsanto's Roundup
forcing farmers to use other herbicides or multiple modes of action.
But farmers are finding that these other modes of action aren't
working either - and there appears to be little relief on the horizon.
Farmers are also frustrated&nbsp; because these additional herbicides
are costing them profits.<br>
<br>
Critics of the industry point out that Monsanto and its competitors
have known about glyphosate resistance.<br>
Brett Lorenzen, a legal analyst with the Environmental Working Group,
stated &quot;It's hard to read a 54-page booklet.&quot;&nbsp;<br>
<br>
Laurel writes:<br>
Monsanto apparently had an aggressive PR campaign to convince farmers
that GM crops would make it easier and cheaper to farm.&nbsp; It's
unfortunate that farmers are now seeing the truth and are apparently
having a difficult time purchasing non GM crops.<br>
The quote about the 54 page booklet being &quot;hard to read&quot; is
very telling.</font></blockquote>
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The Iowa Native Plants Mailing List provides a forum for those interested in Iowa's natural<br>
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