Source: Bayer CropScience

Bayer CropScience is looking back at an unusual anniversary that most cereal growers across the Northern Plains would just as soon forget. It was two decades ago that the first ALS-resistant weeds were documented: kochia and Russian thistle. The problem started slowly then came to plague the region for 20 years until the unique mode of action in Huskie herbicide, a unique mode of action that the industry looks to preserve using the lessons learned from ALS resistance.

"The first resistant weeds were discovered in my area," said Brad Birch, owner of Dry Fork Ag in Ledger, Mont. "Everybody had been using ALS chemistry. When they first began seeing reduced performance, they weren't sure what was going on, but then a bioassay confirmed that the kochia was resistant."

Ed Davis, research agronomist at Montana State University, explains that adoption of ALS chemistry was so quick and widespread because it controlled the state's big three weeds, kochia, Russian thistle and wild buckwheat. "Close to 90 percent of our growers relied on ALS herbicides."

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