Weeds: Palmer Amaranth
Palmer amaranth reigns as one of the most aggressive weeds in the U.S., from Mississippi to Minnesota. What makes it such a challenge is its long emergence time frame, rapid growth rate and ability to produce a significant number of seeds, and significant amount of genetic diversity, which lends itself to developing herbicide resistance.
With a wide emergence window from April to August, Palmer amaranth is always a threat in the field. This is backed by its ability to produce upwards of 1 million seeds per plant. Palmer amaranth isn’t just a threat this growing season, but also next year and the seasons to come after that.
Herbicide resistance is already synonymous with this weed. Like its cousin, waterhemp, Palmer amaranth has developed a knack for resistance development, from six-way site of action to metabolic resistance mechanisms. And, like other weeds, traditional herbicides like glyphosate and ALS inhibitors have become ineffective on this species in many places. Today, management of this weed pest requires a carefully built strategy including the use of effective herbicides and applicable cultural practices.
Help keep your fields clean of Palmer amaranth this year and beyond with these tools and insights.
Did you know?
*In extremely heavy pressure and poor crop competition
Your toolkit to success
Whether growing corn or soybeans, there’s an FMC herbicide that fits your application timing and weed spectrum needs. See how solutions like Authority® Supreme herbicide, Authority® Edge herbicide and Anthem® MAXX herbicide can be integrated into your weed management strategy to enhance control in your fields.
Soybeans
PRODUCT APPLICATION AT THE FOLLOWING STAGES FOR OPTIMAL WEED CONTROL
Burndown/
Preemergence
Authority® Supreme herbicide
or Authority® Edge herbicide
Can be applied preplant, preplant incorporated or preemergence up to three days after planting but before emergence. For use rate, please consult the product label and your local agronomist.
TANK-MIX PARTNERS*
- Burndown/early preplant: 2,4-D/dicamba
- Preemergence: glyphosate, glufosinate, paraquat and/or metribuzin
Emergence
Anthem® MAXX herbicide
Early postemergence through V6 soybean stage. Apply in a tank-mix with other post herbicides for broad-spectrum grass and broadleaf control.
USE RATE AND TANK-MIX PARTNERS
- Use Rate: 3.25 fl. oz./A is typical POST.
- Tank-mix partners*: Anthem MAXX herbicide is an approved tank-mix partner for key postemergence technologies that deliver an additional mode of action and residual control to the tank with tools like XtendiMax®, Engenia®, Enlist One® and Enlist Duo® herbicides.
CORN
PRODUCT APPLICATION AT THE FOLLOWING STAGES FOR OPTIMAL WEED CONTROL
Planting - Emergence to V4 Leaf Development
Anthem MAXX herbicide
Early preplant: 15-45 days prior to planting.
USE RATE AND TANK-MIX PARTNERS:
- Use rate: 4 fl. oz./A
- Tank-mix partners*: 2,4-D/dicamba, glyphosate, glufosinate, paraquat and/or metribuzin
Through V4 corn stage
Early post provides best control of small weeds plus residual. See label for application rates and soil texture.
USE RATE AND TANK-MIX PARTNERS:
- Use rate: 3.25 fl. oz./A
- Tank-mix partners*: 2,4-D/dicamba, glyphosate, glufosinate, paraquat and/or metribuzin
* If there are questions about any tank-mix recommendations, please consult with the product labels, local agronomist or FMC Technical Services Manager.
Engenia herbicide and XtendiMax herbicide with VaporGrip Technology are Restricted Use Pesticides. Always read and follow all label directions, precautions and restrictions for use. Some products may not be registered for sale or use in all states. FMC, the FMC logo Anthem and Authority are trademarks of FMC Corporation or an affiliate. Engenia is a trademark of BASF Corporation. XtendiMax is a trademark of Bayer CropScience Enlist One and Enlist Duo are trademarks of Corteva Agrscience. Enlist Duo and Enlist One are the only 2,4-D products authorized for use with Enlist crops.©2023 FMC Corporation. All rights reserved. 23-FMC-1439 05/23
