Eric Yu, UMN Extension Crops Educator, David Nicolai, UMN Extension Crops Educator, Ryan Miller, UMN Extension Crops Educator, Debalin Sarangi, UMN Extension Weed Scientist
As the growing season approaches, staying informed about the latest herbicide innovations is essential for effective crop management and maximizing yield. The agricultural landscape continues to evolve, with new products introduced regularly to improve weed control, protect crops, and address herbicide resistance. This article builds on last year’s Minnesota Crop News overview of new herbicides and includes a new section highlighting key updates, such as regulatory changes and label modifications that may impact herbicide use this season. It is important to note that many “new” herbicides are reformulations of existing active ingredients or new premixes. Below are several herbicides to watch in the coming season, including products from AMVAC, BASF, Bayer, Corteva, FMC, and Syngenta.
We also recommend referring to the “Take Action Herbicide Mode of Action Chart” which is designed to help farmers and ag professionals quickly and efficiently sort through commercially available herbicide products and determine their modes of action. The chart organizes herbicides and herbicide premixes by their modes of action, grouped by Group Number (0 to 29) and color-coded for easier reference. By comparing your herbicide program with the chart, growers can rotate among herbicides with different sites of action, helping to delay the development of herbicide resistance.
Note: The typical use rate provided for each product is based on medium-textured soil. Understanding your soil type is essential to applying the correct rate. Always refer to the product label to verify the appropriate rate for your specific soil type, crop, and target weeds.
New Herbicides
AMVAC
Zalo is a postemergence (POST) herbicide containing quizalofop-P-ethyl (Group 1) and glufosinate ammonium (Group 10). It is labeled for glufosinate-resistant soybeans up to the R1 stage and canola up to 14 days before flowering or no later than 65 days before harvest. The typical use rates are 32–43 fluid ounces per acre for soybeans and 22–29 fluid ounces per acre for canola. At 32 fluid ounces per acre of Zalo, the estimated equivalent rates are 31.3 fluid ounces per acre of Liberty 280 SL and 8.4 fluid ounces per acre of Assure II. At 43 fluid ounces per acre of Zalo, the equivalents are 42.1 fluid ounces per acre of Liberty 280 SL and 11.3 fluid ounces per acre of Assure II. The addition of quizalofop-P-ethyl broadens the spectrum of weed control, effectively managing a wide range of annual broadleaf weeds while also enhancing activity against grasses. However, tank-mixing postemergence herbicides can antagonize quizalofop-P-ethyl activity and reduce control of grasses and volunteer corn. Antagonism has been documented with several broadleaf herbicide groups, including Group 2 (e.g., Classic, FirstRate, Scepter), Group 4 (e.g., Enlist One, dicamba), Group 6 (e.g., Basagran), and Group 14 (e.g., Flexstar, Cobra).
Source : umn.edu