Category Archives: Weeds

Multiple-Herbicide Resistant Waterhemp in Tennessee

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Waterhemp that escaped multiple applications of Engenia + Glyphosate

Last year we reported on waterhemp in Montgomery and Macon counties that was resistant to dicamba.  We came to this conclusion from both research we conducted in the fields and the confirmation of those results by greenhouse research. The greenhouse research was conducted at Purdue University by my colleague Dr. Bill Johnson and his graduate student Claudia Bland. Continue reading

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Fall Application Ryegrass Control

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Corn in a ryegrass field

Ryegrass has become a serous weed issue in some fields that past couple of years.  A major reason for this is that much of it is now glyphosate-resistant.  Even if clethodim is used rather than glyphosate often it is applied on ryegrass sometime in late March through April when the grass is too well established to provide consistent control. Continue reading

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A Step Back on Palmer Amaranth Control

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Picture 1. Palmer Amaranth Escapes in Xtend Soybean

Driving across West Tennessee last week it is very apparent we have taken a step backward on Palmer amaranth control.  Many fields that looked clean from the road in late July are now showing large Palmer amaranth escapes. Upon closer inspection the pigweed escapes are at least partially affected by the dicamba applications which resulted in them staying hidden from the road until the last couple of weeks. Continue reading

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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

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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

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Middle Tennessee Soybean Scout School

UT Soybean Scout Schools

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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. Three 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 17th, 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.

Middle Tennessee Soybean Scout School
Middle Tennessee Soybean Scout School

Middle TN – Coffee County, July 18th, 9:00 AM – 11:30 AM. This school will be at Graham Farms,8141 Woodbury Hwy., Manchester, TN. Please contact Amy Willis Prince of the UT Coffee County Extension Office at 931-723-5141 or awillis2@utk.edu if you plan to attend.

 

 

 

East Tennessee Soybean Scout School
East Tennessee Soybean Scout School

East TN –  Monroe County, July 19th, 9:00 AM – 11:30 AM. This school will be held at the  Monroe County Farm Bureau Office 501 Main Street, Madisonville, TN 37354.  Lunch will be provided. A head count is required for the meal, please contact Jonathan Rhea of the UT Monroe County Extension Office at 423-442-2433 or jrhea@utk.edu if you plan to attend.

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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

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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

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