All posts by Clay Perkins Postdoctoral Research Associate

Managing Dicamba or Enlist One Resistant Palmer Amaranth

(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

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

2021 Cotton Focus Video Series: Grass Management by Dr. Larry Steckel, Clay Perkins

Our second series of presentations for the 2021 Cotton Focus Video Series are from Dr. Larry Steckel’s program.  Dr. Steckel and his PhD student, Clay Perkins, will be presenting  two topics for us- the first is ‘Grass Management in Xtend and Enlist Cotton’ and the second is ‘Characterization and Management of Glyphosate-Resistant Junglerice’.  We are extremely blessed to have Dr. Steckel in Tennessee and I’m excited to have these two very important topics covered, especially after the challenges we’ve faced with grasses in recent years.

You can find links to Dr. Steckel’s and Mr. Perkins’ presentations below.






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

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

Results of UT Studies on Reasons for Junglerice Becoming a Major Pest in Tennessee Xtend Cotton and Soybean Acres

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Junglerice Escaping: Glyphosate+Engenia /fb Glyphosate+Engenia+Clethodim

The results of some studies UT Extension has done to try to determine why junglerice has become a major weed pest in Tennessee Xtend cotton and soybean acres has provided some insights. This research was in-part supported by the Tennessee Soybean Promotion Board and from Cotton Incorporated. Continue reading

Junglerice/Barnyardgrass Starting to Emerge in Tennessee

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Emerging Junglerice

We have started to notice Junglerice/Barnyardgrass emergence here in West Tennessee on Tuesday (April 28th). The key way to ID junglerice at this young stage is the purple base and flat stem. As the grass matures, you will start to notice some purple striping on the leaves as well as not having a ligule.

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Dicamba Tank mixing with Glyphosate and/or Clethodim Effect on Junglrice Control

Xtend Cotton in a Junglerice field

The call of the spring and now well into the summer is on failed attempts to control junglerice and goosegrass in Xtend crops. The most recent rash of calls have been from very frustrated folks who have not controlled one of those grass species even after three applications of glyphosate and/or clethodim. Most of these failed applications are coming from tank mixing Engenia or XtendiMax in the tank with either glyphosate, clethodim, or both. Continue reading