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ALS Resistant Broadleaf Weeds Appearing in the Southeast

Earlier this week, NC State Extension Small Grain Specialist Dr. Randy Weisz and weed specialist Dr. Wes Everman sent information to growers about being proactive with ALS-inhibitor resistant broadleaf weeds. Weisz explains that while not a problem yet, they’re going for a proactive approach:

“This is really a very, very, very early warning. My intention is to just plant the idea that this is something that growers should be aware of as they manage broad leaf weeds in their small grains. And that some small adjustments to many of the programs that they are using might go a long way in preventing this from coming along.”

Weisz explains that chickweed in particular is showing signs of ALS resistance in some areas:

“There are some localized populations of resistant chickweed that have been found in Virginia. Specifically, its resistant to Harmony extra. Since Harmony is probably one of the most important tools that our NC growers have for broad leaf weed control, I wanted to let them know that there is this little concern that we are beginning to see the first signs of ALS resistant chickweed.”

The overall message, Weisz says is not to overuse any one mode of action:

“I think its important that growers know that we need to start thinking about rotating modes of action when we take care of our broad leaf weeds and small grains.”

Weisz explains that most of the herbicides for small grains are ALS inhibitors:

“The major tools that growers have been using over the years for broad leaf weed control have been primarily Harmony extra, and more recently Osprey and Powerflex – also ALS inhibitors. Almost every single one of the major tools and herbicides that our growers are using for broad leaf weed control are ALS inhibitors.”

Tomorrow we’ll get an update on the wheat crop from NC State Small Grain Spcialist Dr. Randy Weisz. is dedicated to serving the agricultural industry in the Carolinas and Virginia with the latest ag news, exclusive regional weather station readings, and key crop market information. The website is a companion of the Southern Farm Network, provider of daily agricultural radio programming to the Carolinas since 1974. presents radio programs, interviews and news relevant to crop and livestock production and research throughout the mid-Atlantic agricultural community.