Category Archives: Soybean

Manage Large Palmer amaranth Escapes

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Picture 1. Palmer amaranth escapes from Engenia + glyphosate. Picture taken 30 days after application.

We have visited fields where growers assumed their Engenia or XtendiMax + glyphosate had controlled Palmer amaranth only to find that many had escaped and are now quite large (Picture 1). The question is what are some approaches to manage these escapes? Continue reading


Management of Auxin-Herbicide Resistant Palmer Amaranth

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In fields where dicamba and 2,4-D are no longer effectively controlling Palmer amaranth what are some options to help manage this weed?  We conducted research at several locations this year trying to answer this question.

Picture 1. Palmer amaranth escapes from dicamba + glyphosate on 4″ Palmer followed by dicamba + glyphosate 7 days later.  Picture taken 21 days after last application

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Dicamba and 2,4-D: No longer “Palmer amaranth Herbicides” in Some Fields

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Picture 1. Palmer amaranth escapes 18 days after 12.8 ozs Engenia+ 32 ozs glyphosate. A farmer’s field, Lauderdale county, TN

For the past week we have been getting reports along with a good many pictures of Palmer amaranth escaping dicamba application/s from retailers and consultants scouting fields (Picture 1 and 2).  As one retailer so aptly described it today “there are spots in fields where the lack of Palmer control is frightening”. Continue reading


More Reports of Barnyardgrass/Junglerice Escaping Glyphosate and/or Clethodim

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There have been several reports last week of multiple glyphosate and/or clethodim applications not controlling barnyardgrass or junglerice.  We really do not know the precise reasons for the lack of control in any given field but based on previous research and past experience there are three likely causes. Continue reading


Palmer amaranth Control Options now that June 30 Dicamba Cut-Off in Soybean has Arrived

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It is July 1, 2021 so the June 30 cut-off to spray dicamba over Xtend soybean has passed.   The questions of the week have been once July has arrived what alternatives are there to control Palmer amaranth in soybean? Continue reading


Reminder: UT Weed Tour (This Wednesday June 16, 2021)

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JACKSON, Tenn. – The University of Tennessee Institute of Agriculture will host the annual Weed Tour on Wednesday, June 16 at the West Tennessee AgResearch and Education Center. The guided tour will feature 60 weed management research tests in corn, soybean and cotton as well as a demonstration of herbicide symptomology. Continue reading