7 Ways U.S. Farmers Can Delay Herbicide Weed Resistance

Brad Allen

May 10, 2022

Weeds are a threat to every farming operation and the number of herbicide resistant weeds continues to grow every year. Creating a strategy to delay the development of resistant weeds is important and should be prioritized on every farm. 

As of April 2022, the U.S. has 127 unique herbicide resistant weeds and Canada has 52. (1)

There are a number of ways a grower can take a proactive approach to ensure a weed resistance management strategy is implemented on every acre.

Let’s get into the weeds with 7 ways to delay the development of herbicide resistant weeds:

1. Use herbicide group numbers to create effective weed selection pressure

Each herbicide group number corresponds to a site of action of an active ingredient. When multiple herbicide groups are applied to control a targeted weed, the weed is less likely to escape a spraying, as it must tolerate many different disruptions to its functioning. (2)

A general example of this would be a known weed in your area which is resistant to both glyphosate (Group 9) and ALS inhibitor active ingredients (Group 2). Create effective weed selection pressure by applying herbicides from other herbicide groups such as S-Metolachlor 7.64(Group 15) and Willowood Sulfen 4SC (Group 14) Download the chart from the United Soybean Board here.

2. Know your adjuvant requirements

Proper adjuvants increase the efficacy of your burndown and preemergence herbicides. Consult your label to see which adjuvants are required, recommended or may be used.

Whether you need a surfactant, a crop oil or a drift inhibitor, take the time to familiarize yourself with the products that can help you get the most out of your herbicide shot, and limit unintended impacts. FBN® offers a robust line of Farmers First™ branded adjuvants for all your herbicide, insecticide and fungicide applications. Download the Farmers First Adjuvant Product Guide here.

3. Include tillage as a weed management tool

Utilizing tillage as part of an integrated weed management program with herbicide applications can help reduce seed banks by controlling emerged weeds and burying non-germinated seed. (3) 

4. Change planting and fertilizer strategies to enhance the crop canopy

Experiment with narrower rows and banding fertilizer to hasten the growth of a crop canopy to shade out competitive weeds.

5. Avoid spreading weed seeds by cleaning equipment before leaving each field

Plus, the work that you do to control troublesome weeds in the fence rows adjacent to your fields will also reduce the spread of weeds.

6. Break weed cycles

Prevent certain weeds from becoming dominant with crop rotations. This would include row crops, small grains, and cover crops.

7. Herbicide rotation

There are many herbicides that are labeled to control the same weed species. Using the same herbicide year after year may initiate resistance, decreasing your ability to control the weeds. Herbicide diversity plays an important role in fighting resistance.

Shop for herbicides 

Find the products you need at FBN Direct®. We have a diverse product portfolio to provide product options for growers like you to develop an integrated weed management strategy.

Top Preemergence Herbicides at FBN®

Herbicide Group

Crop

FBN Product

Group 9

*Preemergence Corn & Soybeans

AgSaver™ Glyphosate 53.8%

Group 10

*Preemergence Corn & Soybeans

Willowood Glufosinate 280SL

Group 15

Corn & Soybeans

S-Metolachlor 7.64

Group 5

Corn ONLY

Atrazine 4L

Group 15, Group 27, Group 5

Corn ONLY

Meto 1.7 + Meso 0.22 + Atrzn 1.66 (Same active as Stalwart 3W)

Group 14

Soybeans ONLY

Willowood Sulfen 4SC

Group 14, Group 2

Soybeans ONLY

Willowood Sulfen Cloran

*Group 9 Postemergence on Glyphosate traited crops ONLY

*Group 10 Postemergence Glufosinate traited crops ONLY


Sources:

Copyright © 2014 - 2022 Farmer's Business Network, Inc. All rights Reserved. The sprout logo, “Farmers Business Network”, “FBN” and “FBN Direct” are servicemarks, trademarks or registered trademarks of Farmer's Business Network, Inc.

FBN Direct products and services and other products distributed by FBN Direct are offered by FBN Inputs, LLC and are available only in states where FBN Inputs, LLC is licensed and where those products are registered for sale or use, if applicable. If applicable, please check with your local extension service to ensure registration status. Nothing contained on this page, including the prices listed should be construed as an offer for sale, or a sale of products. All products and prices are subject to change at any time and without notice. Terms and conditions apply.

ALWAYS READ AND FOLLOW LABEL DIRECTIONS. It is a violation of federal and state law to use any pesticide product other than in accordance with its label. The distribution, sale and use of an unregistered pesticide is a violation of federal and/or state law and is strictly prohibited. We do not guarantee the accuracy of any information provided on this page or which is provided by us in any form. It is your responsibility to confirm prior to purchase and use that a product is labeled for your specific purposes, including, but not limited to, your target crop or pest and its compatibility with other products in a tank mix and that the usage of a product is otherwise consistent with federal, state and local laws. We reserve the right to restrict sales on a geographic basis in our sole discretion. You must have a valid applicator license to use restricted use pesticides. Please consult your state department of agriculture for complete rules and regulations on the use of restricted use pesticides, as some products require specific record-keeping requirements.

The material provided is for educational purposes only. It is not intended to be a substitute for specific agronomic, business, legal, investment or professional advice. Where specific advice is necessary or appropriate, consult with a qualified agronomist, financial planner, or investment manager. Neither Farmer's Business Network, Inc. nor any of its affiliates makes any representations or warranties, express or implied, as to the accuracy or completeness of the statements or any information contained in the material and any liability therefore is expressly disclaimed.

Brad Allen

May 10, 2022