Category Archives: Weeds

Multiple-Herbicide Resistant Waterhemp in Tennessee

Author:  Comments Off on Multiple-Herbicide Resistant Waterhemp in Tennessee
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

Print Friendly, PDF & Email

Fall Application Ryegrass Control

Author:  Comments Off on Fall Application Ryegrass Control
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

Print Friendly, PDF & Email

A Step Back on Palmer Amaranth Control

Author:  Comments Off on A Step Back on Palmer Amaranth Control
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

Print Friendly, PDF & Email

Ryegrass and Poa Management in Wheat

Author:  Comments Off on Ryegrass and Poa Management in Wheat

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

Print Friendly, PDF & Email

When Dicamba Fails: Success and Failure

Author:  Comments Off on When Dicamba Fails: Success and Failure
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

Print Friendly, PDF & Email