This is a public-interest archive. Personal data is pseudonymized and retained under GDPR Article 89.

RE: RE:Atrazine!

Ed,

Many of the pastures I worked on in southern Iowa had high abundance of tall fescue, and unfortunately atrazine did not do very well in supressing it.  There were no significant decreases in fescue abundance due to any of the treatments -- fire, atrazine, and fire+atrazine.   I was using the recommended level of atrazine for weed control in corn (2 lbs/ac or  2.2 kg/ha).

Atrazine did a great job reducing K. bluegrass,  C. bluegrass, redtop, and smooth brome, but not fescue.  I don't know what a higher dosage would do, but I don't think it would be a good idea given atazine's persistence.

Current research I am doing with a 3 year old prairie reconstruction along a highway roadway has shown a significant decrease in tall fescue (density of tillers) after one late fall burn (mid Nov).  This sounds similar to your situation since you should have a fairly decent fuel base from warm-season growth.  I can't be certain of the cause but can only speculate that perhaps fescue needs that fall growth period when temperatures are cooler for energy acquisition for maintenance.  A slightly earlier fall burn may be more helpful.


Thomas Rosburg
Dept. of Biology
Drake University
Des Moines, Iowa
515-271-2920
thomas.rosburg@drake.edu


On 8/21/99, prairie wrote:
>We have a problem with tall fescue in a 2yr old >planting.Do you think
>atrazine could be effective and how and when should >it be applied?
>Ed Cook
>Southern Illinois
>
>
>-----Original Message-----
>From: Thomas Rosburg <thomas.rosburg@drake.edu>
>To: prairie <prairie@mallorn.com>
>Date: Saturday, August 21, 1999 8:31 AM
>Subject: RE:Atrazine!
>
>
>>Back in the late 80's I did research invesigating >the effects of fire and
>atrazine on prairie restoration (check Rosburg and >Glenn-Lewin 1992, Proc.
>of 12th N.A. Prairie Conference).  I did not see >any evidence that the
>prairie species we were working with were >susceptible to atrazine.  Of
>course none of the warm-season grasses are >susceptible (they're like corn),
>so the main concern is with the forbs.  My sense is >that since atrazine
>needs to be picked up by root systems in the upper >portion of the soil
>profile (thats why it is effective on annual weedy >species), the
>deeper-rooted prairie species don't absorb enough >to do much damage.   I
>would not be too concerned.  In fact you may get a >better establishment.
>Some of the best results (restoration of prairie >species) that I saw in my
>research were on the pastures where atrazine was >applied.  It provided great
>control on cool-season grasses.  I really think >that, if used properly, it
>is a herbicide that could be used effect!
>> ively in prairie establishment.
>>
>>
>>Thomas Rosburg
>>Dept. of Biology
>>Drake University
>>Des Moines, Iowa
>>515-271-2920
>>thomas.rosburg@drake.edu
>>
>>
>>On 7/19/99, prairie wrote:
>>>Hello fellow prairie enthusiasts,
>>>I am a grad student at Western Michigan >University.  >Quite recently,
>>>folks here have begun tossing around the idea of >a >prairie restoration
>>>on our campus of about 50 acres--yippie!!!  We've >>been putting together
>>>species lists, burning regimes, and coming up >with >all sorts of research
>>>projects.  The administration is very anxious to >>get something planted
>>>on this open area that for the past many years >has >been farmed.  The
>>>original plan was to seed it this fall.  Trouble >>is, we just discovered
>>>that it was treated with Atrazine last spring.  >>We've been doing some
>>>research on this troublesome chemical, and it >seems >that it breaks down
>>>in about 2 years or so on the surface, but >leaches >down and takes much
>>>longer to break down at deeper levels of soil.  >How >have you who have
>>>done restorations/plantings dealt with this?  Can >>we go ahead and plant
>>>this coming spring, and then hope that the >Atrazine >will break down
>>>quickly enough that by the time our forbs' roots >>reach down that far,
>>>they will not be affected?  We'd greatly >appreciate >advice from folks
>>>who've dealt with this specifically for prairie >>plants.
>>>
>>>Thanks much,
>>>Theresa Mau-Crimmins
>>>x93mau@wmich.edu
>>>
>>>-------------------------------------------------
>--
>>>------------------
>>>To sign-off this list, send email to >>majordomo@mallorn.com with the
>>>message text UNSUBSCRIBE PRAIRIE
>>>
>>>
>>>
>>>RFC822 header
>>>-----------------------------------
>>> Return-path: <owner-prairie@mallorn.com>
>>> Received: from CONVERSION-DAEMON by >>ACAD2.DRAKE.EDU (PMDF V5.2-29
>#30567)
>>>  id <01JDQUE72MMO002IZQ@ACAD2.DRAKE.EDU> for >>thomas.rosburg@drake.edu;
>Mon,
>>>  19 Jul 1999 10:26:17 CDT
>>> Received: from lorien.mallorn.com >>([198.88.188.30])
>>>  by ACAD2.DRAKE.EDU (PMDF V5.2-29 #30567)
>>>  with ESMTP id >><01JDQUE5KXYQ002MYK@ACAD2.DRAKE.EDU> for
>>>  thomas.rosburg@drake.edu; Mon, 19 Jul 1999 >>10:26:16 -0500 (CDT)
>>> Received: (from majordomo@localhost) by >>lorien.mallorn.com (8.9.3/8.9.3)
>>>  id KAA27433 for prairie-outgoing; Mon, 19 Jul >>1999 10:01:47 -0500
>>> Received: (from root@localhost) by >>lorien.mallorn.com (8.9.3/8.9.3)
>>>  id KAA27428 for prairie; Mon, 19 Jul 1999 >>10:01:46 -0500
>>> Received: from gw.wmich.edu (gw.wmich.edu >>[141.218.1.100])
>>>  by lorien.mallorn.com (8.9.3/8.9.3) with ESMTP >id >JAA27291 for
>>>  <prairie@mallorn.com>; Mon, 19 Jul 1999 >09:55:49 >-0500
>>> Received: from eeyore.cc.wmich.edu
>>>  (PMDF_BATCH@eeyore.cc.wmich.edu >[141.218.20.103])
>>>  by gw.wmich.edu (8.9.3/8.9.3) with ESMTP id >>KAA23163 for
>>>  <prairie@mallorn.com>; Mon, 19 Jul 1999 >10:55:45 >-0400 (EDT)
>>> Received: from CONVERSION-DAEMON by WMICH.EDU >>(PMDF V5.2-32 #35219)
>>>  id <01JDQVEQ14RK95N3B4@WMICH.EDU> for >>prairie@mallorn.com; Mon,
>>>  19 Jul 1999 10:55:44 -0400 (EDT)
>>> Received: from wmich.edu
>>>  ("port 1090"@pm539-06.dialip.mich.net >>[198.108.161.112])
>>>  by WMICH.EDU (PMDF V5.2-32 #35219)
>>>  with ESMTP id <01JDQVEOPCT695N3O2@WMICH.EDU> >for >prairie@mallorn.com;
>Mon,
>>>  19 Jul 1999 10:55:43 -0400 (EDT)
>>> Date: Mon, 19 Jul 1999 11:06:22 -0400
>>> From: Theresa Mau-Crimmins ><theresa.mau@wmich.edu>
>>> Subject: Atrazine!
>>> Sender: owner-prairie@mallorn.com
>>> To: "prairie@mallorn.com" <prairie@mallorn.com>
>>> Reply-to: prairie@mallorn.com
>>> Message-id: <37933EED.B7709C4@wmich.edu>
>>> MIME-version: 1.0
>>> X-Mailer: Mozilla 4.04 [en] (Win95; I)
>>> Content-type: text/plain; charset=us-ascii
>>> Content-transfer-encoding: 7BIT
>>> Precedence: bulk
>>> X-md5sum: 79a2a7ef38ef120c48a8338249bbec59
>>> X-md5sum-Origin: lorien.mallorn.com
>>> >
>>
>>--------------------------------------------------
>-------------------
>>To sign-off this list, send email to >majordomo@mallorn.com with the
>>message text UNSUBSCRIBE PRAIRIE
>>
>
>---------------------------------------------------
>------------------
>To sign-off this list, send email to >majordomo@mallorn.com with the
>message text UNSUBSCRIBE PRAIRIE
>
>
>
>RFC822 header
>-----------------------------------
> Return-path: <owner-prairie@mallorn.com>
> Received: from lorien.mallorn.com >([198.88.188.30])
>  by ACAD2.DRAKE.EDU (PMDF V5.2-29 #30567)
>  with ESMTP id ><01JF16GZ1ZQ6000K04@ACAD2.DRAKE.EDU> for
>  thomas.rosburg@drake.edu; Sat, 21 Aug 1999 >14:28:34 CDT
> Received: (from majordomo@localhost)	by >lorien.mallorn.com (8.9.3/8.9.3)
>  id OAA20428	for prairie-outgoing; Sat, 21 Aug >1999 14:08:18 -0500
> Received: from cdale3.midwest.net >(cdale3.midwest.net [208.235.1.20])
> 	by lorien.mallorn.com (8.9.3/8.9.3) with >ESMTP id OAA20424	for
>  <prairie@mallorn.com>; Sat, 21 Aug 1999 14:08:17 >-0500
> Received: from galed (marion114.midwest.net >[208.235.6.124])
> 	by cdale3.midwest.net (8.9.3/8.9.1) with SMTP >id OAA11303	for
>  <prairie@mallorn.com>; Sat, 21 Aug 1999 14:10:42 >-0500 (CDT)
> Date: Sat, 21 Aug 1999 14:07:25 -0500
> From: Ed and Gale <galed@midwest.net>
> Subject: Re: RE:Atrazine!
> Sender: owner-prairie@mallorn.com
> To: prairie@mallorn.com
> Reply-to: prairie@mallorn.com
> Message-id: <001001beec08$68a83460$7c06ebd0@galed>
> MIME-version: 1.0
> X-MIMEOLE: Produced By Microsoft MimeOLE >V4.72.3110.3
> X-Mailer: Microsoft Outlook Express 4.72.3110.1
> Content-type: text/plain; charset=iso-8859-1
> Content-transfer-encoding: 7BIT
> X-Priority: 3
> X-MSMail-priority: Normal
> Precedence: bulk
> X-md5sum: 59688eca12811f9a26a47560b7ea67f0
> X-md5sum-Origin: lorien.mallorn.com
> >

---------------------------------------------------------------------
To sign-off this list, send email to majordomo@mallorn.com with the
message text UNSUBSCRIBE PRAIRIE
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index