Managing large Palmer amaranth in corn near atrazine cut-off

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

Judging by our research here as well as phone calls from folks walking corn fields, it is very apparent that pretty much any PRE applied herbicide in corn has given out. Even some of the PRE applied herbicides that traditionally have provided consistently long weed control like Lexar or Bicep have clearly given out about 25 days after application. In other instances, I have had folks report that no PRE was applied to the corn and Palmer amaranth is good size.

Everyone is well behind with respect to spraying. Way too many windy days and now a very wet Wednesday will keep sprayers out of the field until next week. With that in mind there will be many fields of corn where both the corn and the Palmer amaranth will be large at time of spraying. What are some good management strategies for this situation?

Popular premixes such as Halex GT or Capreno are effective in controlling Palmer up to 6’’ depending on the rate of application. These herbicides are commonly tank mixed with atrazine to provide control of Palmer that is larger than 6’’ tall. However, atrazine can only be applied to corn that is 12’’ or less in height.

Halex GT or Capreno are good options, but in field of high pressure or with large Palmer, these herbicides as a standalone application aren’t enough. Relying solely on either of these herbicides, particularly on Palmer greater than 6’’ can promote resistance development in weeds to HPPD inhibiting herbicides. An ongoing study has shown that both Halex GT and Capreno in combination with Status provides effective control of Palmer larger than 6’’. The recommended rate is 4 pts./A of Halex GT or 3 ozs./A of Capreno plus 8 ozs./A of Status. Status and Halex GT can be applied up to 30’’ tall corn. Capreno can be applied to corn up to the 6 leaf stage.


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...


Comments (0) Leave a comment 

Name
e-Mail (required)
Location

Comment:

characters left


Smooth Wall Grain Bins

Meridian’s SmoothWall bins are the ultimate storage bins, used to handle and store fertilizer, grain, feed and seed, and extend ... Read More

View all Products in this segment

View All Buyers Guides

Feedback Form
Feedback Form