All posts by Larry Steckel, Extension Weed Specialist

Post-Direct Applied Herbicide Applications in Cotton

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Palmer amaranth escapes after sequential POST dicamba + glyphosate applications in 2020

Some of the earlier planted cotton fields will soon be entering the true “laying it by” application timing.  Given that some in 2020 were not successful spraying the same Palmer amaranth or junglerice multiple times with glyphosate + dicamba going back to an “old school” layby is a good plan. 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


Managing Dicamba or Enlist One Resistant Palmer Amaranth

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(Picture 1) 20 DAA: Palmer amaranth escapes from 22 ozs XtendiMax + 16 ozs Clethodim + 32 ozs glyphosate applied on 1 to 4″ weeds

Judging from research tests and walking a few farmers’ fields many of the PRE applied herbicides in soybean and cotton played out about a week or so ago.  Timing is everything on trying to do the best job on Palmer amaranth that has broken through the PREs.  With respect to Palmer amaranth that has low-level dicamba or 2,4-D resistance (2 to 3x), timing is even more important.  Moreover, herbicide selection is also critical in controlling resistant Palmer. Continue reading


Reminder: UT Weed Tour (Next 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 50 weed management research tests in corn, soybean and cotton as well as a demonstration of herbicide symptomology. Continue reading


Start Scouting for Palmer Amaranth that Escapes Dicamba or 2,4-D

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(Picture 1) Dicamba + glyphosate on 3″ Palmer 4 DAA

This picture (Picture 1) was taken just 4 days after a dicamba + glyphosate + clethodim application on 3” Palmer amaranth. Judging from some experience with this Palmer population, the growth after application would suggest it will likely survive. When we revisited the site indeed it had (Picture 2). Fields infested with similar Palmer populations are scattered about in a few counties in West and Middle TN. As such, there will be no substitute for first hand observation to determine if Palmer amaranth is recovering from a dicamba or Enlist application.

In our research more dicamba sensitive Palmer amaranth will often be dead or well on their way under good heat and moisture conditions in 7 days or so.  Palmer that is showing regrowth from the apical meristem or lateral buds around  7 to 10 days after application often will live. Experience from last year would indicate that not only will they live but after a short pause will become quite competitive. Continue reading


Reminder: UT Cotton Scout School (Friday, May 28, 2021)

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The UT Cotton Scout School is scheduled for the last Friday of the month, May 28st, at the West Tennessee Research and Education Center (605 Airways Blvd, Jackson). There is no fee, and preregistration is not required. Registration begins at 8:00 AM with the program starting at 8:30. Content will include classroom and hands-on training with an optional ‘go-to-the-field session’ after a box lunch. Topics covered will include cotton development and identification and symptoms of insect pests, plant diseases, and weeds.


Ryegrass and Johnsongrass Management: Where Do We Go From Here?

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Ryegrass in corn escapes glyphosate + dicamba burndown

This has ,clearly, been the worst year for ryegrass in the state in both corn and wheat.  There are a good many corn fields that are clean where the burndown was glyphosate + clethodim.  Fields where dicamba was added in the burndown are, in most cases, the most infested with ryegrass.  As mentioned in a previous blog, other than just going out and spraying the typical POST corn application and hoping that pushes the ryegrass on to maturity there is no real solution to controlling it. Continue reading


UT Weed Tour (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