Category Archives: Weeds

Dicamba-Resistant Palmer Amaranth in Tennessee: Stewardship Even More Important

Picture 1. Palmer amaranth escapes after a dicamba + glyphosate application in a Gibson County cotton field.

Has Palmer amaranth evolved dicamba resistance in Tennessee?  Results from some of the greenhouse experiments this winter and spring as well as in field research this growing season would suggest that our state now has dicamba-resistant (DR) Palmer amaranth. These DR populations are established in Crockett, Gibson, Madison, Shelby, and Warren counties and likely several others. Continue reading

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Virtual Milan No-till Field Day … Available Now!

Follow the link below to experience the 2020 Milan No-till Field Day at your own pace! You can watch an entire tour by clicking on its name, or just one presentation by clicking on a specific title.

Please note, all links will open in a new tab. Closed captions are available by clicking the “CC” button on the right side of the video’s play bar.

Research Tours

 

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Recording of 2020 UT Soybean Scout School

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Below is a link to the recorded presentation of the 2020 UT Soybean Scout School that was presented today via Zoom. Set aside a little time if you intend to watch. Also keep in mind that much of the same information is available on our other internet resources including http://utcrops.com/soybean/VSSchool.htm and https://guide.utcrops.com/soybean/.

Recording of Soybean Scout School (1h 46 min)

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Strategies to Address Palmer amaranth, junglerice and goosegrass Escapes from Follow-up Applications in Xtend and Enlist Crops.

Carpet of Palmer amaranth escapes from a 0.5 lbs of dicamba + 32 ozs glyphosate + S-metolachlor: Pic taken 20 DAA: S-metolachlor was only herbicide that looked to be working in this field.

Calls continue from some folks frustrated with goosegrass, junglerice and Palmer amaranth escapes after a dicamba + glyphosate application. A large reason for the frustration is the follow-up applications have often provided less control than hoped. Timing is the cause for some of these poor weed control issues. Herbicide resistance is another cause. Continue reading

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Reminder – UT Soybean Scout School via Zoom (July 8th, 9:00 AM – 11:30 AM)

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Because of restrictions due to the COVID-19 situation, the UT Soybean Scout School will be offered by Zoom from 9:00-11:30 AM on Wednesday, July 8th. The Zoom link is provided below.  However, a password is required. Please contact Ms. LaDonn Kelso (dkelso2@utk.edu) or myself (sdstewart@utk.edu) to obtain the meeting password.

The Soybean Scout School provides training for understanding soybean growth and development and the identification, scouting and basic management of pests including insects, weeds, and disease. Pesticide re-certification points and Continue reading

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Concerns About Poor Palmer Amaranth Control with Dicamba

Palmer Amaranth Escaping 2 Applications of Engenia + Roundup PM. Crockett County TN. Pic taken 14 Days after 2nd Application

Calls continue to come in on concerns about poor Palmer amaranth control after a dicamba application. More than a few have reported that Palmer amaranth has survived multiple dicamba + glyphosate applications (Example above). Continue reading

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Junglerice Control after Initial Glyphosate + Dicamba Application

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Glyphosate (32 oz) – 21 DAA

Questions continue to be asked on how to best manage junglerice, barnyardgrass and goosegrass in cotton and soybean. Research earlier this spring looking at grass control after an initial glyphosate + dicamba application showed that if a follow-up glyphosate application was applied 7 days later better than 90% junglerice control could be achieve (data below). Continue reading

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