Category Archives: Weeds

Management of Volunteer Xtendflex Soybeans in Xtendflex Cotton

What are some options to control volunteer XtendFlex soybeans in XtendFlex cotton fields?  This issue is something that we need to do research on as there is no data. As such in answering the question one has to rely exclusively on experience. Unfortunately, all the experience that I and my Midsouth colleagues have does not hint at a real good option to remove these volunteers. Continue reading

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Post-Direct and Hooded Application Options for Cotton

Picture 1. Goosegrass escaping dicamba + glyphosate at burndown followed by dicamba + glyphosate early POST

Some of the earlier planted cotton fields will soon be entering the true “laying it by” application timing.  Given that some are clearly not successful spraying Palmer amaranth, goosegrass or junglerice with glyphosate + dicamba (Picture 1 and 2), going back to an “old school” layby is a good plan. Continue reading

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2022 UT Soybean Scout Schools

UT’s Soybean Scout Schools will be held in 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.

West TN – Madison County, July 11th, 9:00 AM – 11:30 AM. This school will be at the West TN Research and Education Center, 605 Airways Blvd. Jackson TN, 38301. Signs will be up at the station to direct you to the field.

West TN – Henry County, July 12th, 9:00 AM – 11:30 AM. This school will be at Norwood Farms, 645 Norwood Rd, Mansfield, TN.

Middle TN –  Lincoln County, July 13th, 9:30 AM – Noon. This school will be at H&R Agri-Power, 11 Highland Rim Road, Fayetteville, TN 37334.  Lunch will be provided courtesy of H&R Agri-Power. A head count is required for the meal,  please contact Bruce Steelman of the UT Lincoln County Extension Office at (office) 931-433-1582 or (cell) 615-542-1364 if you plan to attend.

 

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Managing Palmer Amaranth

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(Picture 1) Pre applied herbicide breaking earlier than in 2021

Judging by our research plots as well as walking some cotton and soybean fields most Pre applied herbicides are playing out about 7 to 10 days quicker than last spring (Picture 1).  The frequent rain would most likely be the reason for this. Continue reading

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UT Weed Tour (June 15, 2022)

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JACKSON, Tenn. – The University of Tennessee Institute of Agriculture will host the annual Weed Tour next Wednesday, June 15 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

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Best Management Practices for Liberty Applications

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The beginning of June is always a busy planting and spray window.  It will be more so this spring with most of last week a wash to get much field work done. Of course, there will be a good deal of glyphosate and dicamba sprayed this week and likely some Liberty as well. With Liberty in such short supply every quart must count.  This is just a quick reminder that the time of day that Liberty is applied has a large determination on the success or failure of that application.

From 2012 to 2017 we conducted a good many studies examining Liberty performance on Palmer amaranth as affected by the time of day the application was conducted.  All the studies pointed to the same conclusion, that Liberty applied in the middle of the day provided better and more consistent control of Palmer amaranth than either early morning or evening applications (studies conducted in warm weather). As an example, one study (Figure 1.) from 2015 showed good control of 4” tall Palmer amaranth if the Liberty application was applied at noon compared to applications made at dawn or sunset.

Figure 1. Palmer amaranth control from Liberty herbicide as effected by application timing.

In general, the best Liberty performance can be achieved when applications are made from 8:00AM to 6:00PM.

Other environmental factors also greatly effect Liberty’s weed control performance.  It controls weeds best if applied on days where the high temperatures for the day are in the 80s or 90s.  Also, it works best at higher humidity’s as well.  In other words, a typical June or July day.

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UT Cotton Scout School

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The UT Cotton Scout School is scheduled for the last Friday of the month, May 27th, 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 lunch. Topics covered will include cotton development and identification and symptoms of insect pests, plant diseases, and weeds.

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