Residual Control of Marestail in No-Till Beans

decrease font size  Resize text   increase font size       Printer-friendly version of this article Printer-friendly version of this article

Source: Mark Loux, Ohio State University

Residual soybean herbicides should be included in marestail management programs to control plants that emerge between planting (or burndown herbicide application) and soybean canopy closure. The soybeans can adequately suppress plants that emerge after canopy closure. Even the most effective residual herbicides may not completely control marestail during this period, especially when they are applied several weeks before soybean planting. Some considerations in residual herbicide selection:

  • It is important to know whether the marestail population is ALS-resistant. One indicator of this is whether POST application of FirstRate or Classic retains any activity on marestail in the field. If you are unsure about this, assume that the population is ALS-resistant for the purposes of residual herbicide selection. Reminder: the PRE soybean herbicide effectiveness table in the "Weed Control Guide for Ohio and Indiana" has ratings on both ALS-sensitive and ALS-resistant marestail. 
  • The most effective residual herbicides contain active rates of two components — an ALS inhibitor (chlorimuron or cloransulam) and a non-ALS inhibitor such as Valor, Authority or metribuzin. Premix products included here: Valor XLT, Envive, Sonic, Authority First, Authority XL, Gangster. Canopy/Cloak DF actually also falls into this category, but the rate of metribuzin is fairly low at typical product use rates. 
  • The "Roundup Ready" rates recommended on the labels of these premix products will often be adequate where the population is not ALS-resistant since both components of the premix are contributing to the control. However, in ALS-resistant populations that non-ALS component of the premix is providing all of the residual marestail control, and the rate of that component becomes more important. Another way to look at this — Valor will be just as effective as Valor XLT or Envive for control of ALS-resistant marestail, although control of other tough broadleaf weeds may decrease. 
  • The "Roundup Ready" rates of the premixes can supply a relatively low rate of the non-ALS component (flumioxazin, sulfentrazone or metribuzin), and should be increased or supplemented with additional herbicide to obtain enough residual control of ALS-resistant marestail. We suggest aiming for the following rates: metribuzin — 8 to 10 oz/A of 75DF; flumioxazin  — 2.5 oz of Valor; and sulfentrazone — 0.2 to 0.25 lb ai/A. Some examples based on this: the 4 oz rate of Canopy/Cloak DF contains the equivalent of 3.4 oz of metribuzin 75DF so an additional 5 to 6 oz/A of metribuzin should be added; 4.3 oz of Valor XLT are required to apply the equivalent of 2.5 oz of Valor, or additional Valor can be added to lower rates of Valor XLT. This approach is more problematic with Authority products, where the "Roundup Ready" rates can provide much less than 0.2 to 0.25 lb ai/A, because adding sulfentrazone (Spartan) to get to the higher rate is not necessarily cost-effective. 
  • In our research, residual control from saflufenacil (Sharpen) is often in the range of 40 to 70 percent, which is not usually adequate, and it should be supplemented with additional residual herbicide. Since saflufenacil cannot be applied with products that contain flumioxazin or sulfentrazone, what is the most appropriate partner to mix with Sharpen to improve residual marestail control? Scepter and Pursuit are somewhat variable for residual marestail control, and do not control ALS-resistant marestail (Optill is a premix of saflufenacil and Pursuit). We suggest that Canopy/Cloak DF and/or metribuzin are probably the most appropriate tank-mix partners where glyphosate + Sharpen is used as the burndown. As indicated above, whether using metribuzin alone or mixing with Canopy/Cloak DF, aim for a total of 8 to 10 oz/A of metribuzin 75DF. The other approach here is to use Ignite for burndown of marestail instead of glyphosate + Sharpen (the cost is about the same), which allows use of any residual herbicide.

Buyers Guide

Doyle Equipment Manufacturing Co.
Doyle Equipment Manufacturing prides themselves as being “The King of the Rotary’s” with their Direct Drive Rotary Blend Systems. With numerous setup possibilities and sizes, ranging from a  more...
A.J. Sackett Sons & Company
Sackett Blend Towers feature the H.I.M, High Intensity Mixer, the next generation of blending and coating technology which supports Precision Fertilizer Blending®. Its unique design allows  more...
R&R Manufacturing Inc.
The R&R Minuteman Blend System is the original proven performer. Fast, precise blending with a compact foot print. Significantly lower horsepower requirement. Low inload height with large  more...
Junge Control Inc.
Junge Control Inc. creates state-of-the-art product blending and measuring solutions that allow you to totally maximize operating efficiency with amazing accuracy and repeatability, superior  more...
Yargus Manufacturing
The flagship blending system for the Layco product line is the fully automated Layco DW System™. The advanced technology of the Layco DW (Declining Weight) system results in a blending  more...
Yargus Manufacturing
The LAYCOTE™ Automated Coating System provides a new level of coating accuracy for a stand-alone coating system or for coating (impregnating) in an automated blending system. The unique  more...
John Deere
The DN345 Drawn Dry Spreader can carry more than 12 tons of fertilizer and 17.5 tons of lime. Designed to operate at field speeds up to 20 MPH with full loads and the G4 spreader uniformly  more...
Force Unlimited
The Pro-Force is a multi-purpose spreader with a wider apron and steeper sides. Our Pro-Force has the most aggressive 30” spinner on the market, and is capable of spreading higher rates of  more...
BBI Spreaders
MagnaSpread 2 & MagnaSpread 3 — With BBI’s patented multi-bin technology, these spreaders operate multiple hoppers guided by independent, variable-rate technology. These models are built on  more...

Related Articles

Comments (0) Leave a comment 

e-Mail (required)


characters left

Pacesetter Grain Hopper

The Pacesetter Gain Hopper features original and innovative ideas like the patented RollerTrap™, the industry’s easiest to open and maintain trap ... Read More

View all Products in this segment

View All Buyers Guides

Feedback Form
Feedback Form