All posts by Larry Steckel, Extension Weed Specialist

Ryegrass and Poa Management in Wheat

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The two best fall-applied options for ryegrass and poa in wheat are Anthem Flex and Zidua.  Pyroxasulfone is providing the grass control in both these herbicides.   Anthem Flex can be applied as a true PRE right behind the press wheel.  Keep in mind there is some chance of wheat injury from this new use pattern if a rain occurs shortly after planting.  As such, if rain is in the forecast wait and apply it later as a delayed PRE or early POST. Continue reading

When Dicamba Fails: Success and Failure

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Picutre 1. Dicamba pigweed escapes cleaned up in field with follow up Liberty application and a hooded diuron +MSMA application as well as cultivation

I have had the opportunity to visit fields where dicamba application/s failed to control Palmer amaranth and observe the success and failure of follow-up weed control tactics. On the positive side, where more timely and diverse weed control tactics were employed Palmer amaranth control was often a success.  In a couple of cases, timely Liberty applications on Palmer amaranth escapes often provided 70 to 80% control.  Follow-up hooded applications followed by cultivation increased Palmer control in these fields to greater than 95% (Picture 1). Continue reading

Control of Volunteer XtendFlex Soybean in XtendFlex Cotton.

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Picture 1. XtendFlex soybean infesting Xtendflex cotton.

A recent new “weed” issue in XtendFlex cotton is volunteer XtendFlex soybean (Picture 1). Recent research has shown that Envoke at 0.125 to 0.15 ozs/acre provides very good control as soon as 7 days after application (Picture 2). Continue reading

Late-June Palmer Amaranth Management

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Picture 1. Palmer amaranth escapes after two dicamba applications.

Poor performance of dicamba on Palmer amaranth was again the theme of the last ten days.  There have been numerous reports typically with attached pictures of large patches of Palmer amaranth recovering from dicamba application/s (Picture 1). Continue reading

UT Weed Tour will be held this Wednesday June 21, 2023

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JACKSON, Tenn. – The University of Tennessee Institute of Agriculture will host the annual Weed Tour this Wednesday, June 21 at the West Tennessee AgResearch and Education Center. The guided tour will feature about 40 weed management research tests in cotton, corn and soybean. This tour will qualify for Commercial applicator 3 points in categories C01, C04, C10 and C12 as well as CCA 3 points for Crop Management.

Weed Tour runs from 9 – 12:00 a.m., with registration opening at 8:30 a.m. A light breakfast will be served. Continue reading

When Dicamba Fails…

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Picture 1. 3 to 6″ Palmer amaranth escaping Engenia + glyphosate in XtendFlex cotton. Picture taken 12 days after application

Just when it appears that ryegrass has become our most problematic weed, Palmer amaranth goes into “hold my beer and watch this” mode.  In the last 10 days we have fielded numerous reports on dicamba failures to control Palmer amaranth.  Just this past week we were able to visit a number of these fields. Continue reading

Crunch Time for Weed Control

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Picture 1. Goosegrass escaping multiple glyphosate applications. Tipton County. Mid-June 2022

As the calendar turns to June weed management concerns change from ryegrass and horseweed to the summer annuals goosegrass, junglerice and Palmer amaranth.

Tennessee growers are in a real crunch time to control these three summer annual weeds. Big percentages of the corn, soybean and cotton crops all need some kind of POST application right now. The planter technology that can plant three different crops across large acreages very quickly has one drawback. The sprayers often cannot keep up to most every acre needing to be sprayed just as quickly. Continue reading

Herbicide Stewardship

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It is crunch time for weed control in our row crops.  When every minute counts to get herbicide applied it is tempting to cut corners on herbicide stewardship.  The forecast would suggest that Tennessee will be entering a bit of a dry spell.  Herbicide drift is even harder for crops to recover from when drought stressed so please take time to use best management practices applying all herbicides but particularly products that contain dicamba and 2,4-D. Continue reading