Category Archives: Weeds

29 May 2026

UT Soybean Scout School Dates

29 May 2026
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UT’s Soybean Scout Schools will be held in June and July (see details below). These field-side programs cover the basics of soybean growth, scouting, pest identification, and general management. Pesticide recertification and CCA CEU points will be available. Scout Schools are offered free of charge with sponsorship from the Tennessee Soybean Promotion Board. Registration is not required. Participants will receive a scouting notebook and a sweep net while supplies last.

Lake County Soybean Scout School Flier
Lake County Soybean Scout School Flier

West TN – Lake County, June 24th, 9:00 AM – 12:00 PM. This school will be held at 300 Headden Drive Ridgely, TN 38080. Signs will be up to direct you to the field. Contact Charlie Jo Archie for more information. 731-592-9899, chasarch@utk.edu. Please RSVP by June 21st.

West TN – McNairy County, July 15th, 9:00 AM – 12:00 PM. This school will be held in McNairy County (address forthcoming). Signs will be up to direct you to the field. Contact Jon Williams for more information. 731-645-3598, johdwill@utk.edu.

Middle TN – Cannon County, July 16th, 9:00 AM – 12:00 PM. This school will be held in Cannon County (address forthcoming). Signs will be up to direct you to the field. Contact Jared Franklin for more information. 615-563-2554, jfrank57@utk.edu.

 

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13 May 2026

Postemergence Pigweed Control

13 May 2026
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Palmer amaranth remains one of the most difficult weeds to manage, and when pigweed escapes preemergence control, postemergence decisions can quickly turn into a kitchen sink approach where multiple products are added to the tank. Because postemergence options depend on the crop system and trait technology, we evaluated a wide range of postemergence programs in 2025 to better understand overall control trends. Continue reading →

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27 Apr 2026

Stewarding Post Herbicide Applications

27 Apr 2026
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We are 4 weeks early for the typical POST herbicide application window. These applications need to be effective and steward well. In fact stewardship of the herbicides used in those applications is critical. Crops injured by off-target herbicides were numerous last year. While many think about either dicamba or 2,4-D for off-target concerns, last year clethodim drift on corn was the most widely reported issue across the state. Continue reading →

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23 Apr 2026

UT Cotton Scout School (May 20, 2026)

23 Apr 2026
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The UT Cotton Scout School is scheduled for Wednesday, May 20th, 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. Pesticide points in categories 1, 4, 10 and 12 will be offered and a BBQ lunch will be provided. Content will include classroom and hands-on training with an optional go-to-the-field session after lunch. Topics covered will include cotton development and identification and symptoms of insect pests, plant diseases, and weeds. Contact Sebe Brown (318)-498-1283, sbrow175@utk.edu with questions.

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23 Apr 2026

Ryegrass Continues to Persist

23 Apr 2026
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Picture 1. Ryegrass that escaped clethodim+glyphosate competing with emerging soybean

Ryegrass continues to persist in too many fields. Often the ryegrass in these fields has escaped both glyphosate and clethodim (Picture 1).  In fields like this we typically will just have to live with ryegrass over the next 4 weeks as it completes maturity and goes to seed.  Some have asked what can they spray?  Liberty is really the last best option applied on a hot day to help speed up the ryegrass maturity process. Continue reading →

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23 Apr 2026

Herbicide Cutoffs in Corn

23 Apr 2026
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I never thought by mid-April that corn in some fields would have grown to the point it is not safe to apply a pint of dicamba (>5”) yet here we are.  The forecast suggests next week will not be a good spray week so time will be short that other herbicides can be applied safely to corn over the top. Continue reading →

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15 Apr 2026

No-Till Without Paraquat?

15 Apr 2026
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No-till without paraquat?  That may be a possibility. Syngenta announced they will stop producing Gramoxone in June.  This will leave only the companies that sell the generic paraquats to fill the demand.   Will those companies be willing to take on the lawsuits to continue to sell a low margin herbicide? Maybe.  Beyond that, the probability one of those companies in a few years will take the lead on re-registration with the EPA is low.  All that would suggest that the time span paraquat is available could be as short as just a few years. If so, we need to have a Plan B to replace this herbicide in Tennessee over the next couple years. This will be the emphasis of some of our research this year. Continue reading →

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