Category Archives: Weeds

Follow Up Questions on Reports of Poor Palmer Amaranth Control with Dicamba

Author: Larry Steckel, Extension Weed Specialist 1 Comment

The blog on inconsistent dicamba performance on Palmer amaranth has caused some follow up questions.

Is there any difference between Engenia, Xtendimax and Clarity for actual Palmer amaranth control? NO. I know from repeated research with all three that they all perform fairly well on a 1 to 4” Palmer amaranth.  They all often need follow up applications on Palmer that is larger than 4”.

Are PRE applied herbicides needed in Xtend soybeans?  YES. The folks to date who have had issues with dicamba performance were not using any PRE applied herbicides. It is hard to get good coverage in those thick mats of pigweeds where PREs have not been used.

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Late Horseweed Infestation Very Heavy in Some Fields

Author: Larry Steckel, Extension Weed Specialist Comments Off on Late Horseweed Infestation Very Heavy in Some Fields

In a March blog I noted the lack of horseweed (marestail) in many fields but thought an April germination event of this weed could come late to the party and pose a problem.  On occasion I make a good guess, as that has clearly been the case.  Continue reading

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UT Cotton Scout School This Friday

Author: Scott Stewart, IPM Extension Specialist Comments Off on UT Cotton Scout School This Friday

The University of Tennessee Cotton Insect Scout School is scheduled for Friday, May 26 at the West Tennessee Research and Education Center in Jackson. The address in 605 Airways Blvd, Jackson TN. 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 hands-on training with an optional ‘go-to-the-field session’ after a box lunch. Topics covered will include cotton development, identification of insects (and their damage) weed and diseases and their damage, and weed identification.

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Management of Late Season Johnsongrass

Author: Larry Steckel, Extension Weed Specialist Comments Off on Management of Late Season Johnsongrass
Photo credit: Todd Rankin

Questions continue to arise on management of glyphosate-resistant (GR) Johnsongrass in corn, soybean and cotton. GR Johnsongrass continues to become more of an issue with each passing year.  The main threat with Johnsongrass is in corn where there are few POST applied options. Continue reading

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Reminder – Cotton Scout School (Friday, May 26th)

Author: Scott Stewart, IPM Extension Specialist Comments Off on Reminder – Cotton Scout School (Friday, May 26th)

The University of Tennessee Cotton Insect Scout School is scheduled for Friday, May 26 at the West Tennessee Research and Education Center in Jackson. The address in 605 Airways Blvd, Jackson TN. 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 hands-on training with an optional ‘go-to-the-field session’ after a box lunch. Topics covered will include cotton development, identification of insects (and their damage) weed and diseases and their damage, and weed identification.

 

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Recent Midsouth Studies Show Dicamba not Very Effective on some Populations of Glyphosate/PPO-Resistant Palmer Amaranth.

Author: Larry Steckel, Extension Weed Specialist Comments Off on Recent Midsouth Studies Show Dicamba not Very Effective on some Populations of Glyphosate/PPO-Resistant Palmer Amaranth.

Last summer Dr. Tom Barber, University of Arkansas weed scientist, invited me to visit his field research on glyphosate/PPO-resistant Palmer amaranth in Crittenden County, Arkansas. As was expected glyphosate and Flexstar provided very poor Palmer amaranth control in his tests.

What was not expected is that a number of other herbicides provided poor control as well.  Even dicamba at 0.5 lbs/A (Clarity 16 oz) on small Palmer amaranth provided less than optimal control.  Continue reading

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