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NC State Extension Weed Specialist Advises on Combating Resistant Weeds Now and in the Future

Today we are joined by Wes Everman, extension weed specialist with NC State University.

Wes, glyphosate weed resistance has impacted the value and ethicacy of glyphosate herbicides and glyphosate tolerant technologies, how does that knowledge affect a growers management and stewardship of LibertyLink technology?

“the first thing a grower should think about when looking at the LibertyLink technology and comparing it to RoundUp ready, is what can we learn from what happened with these glyphosate resistant technologies. Do we use it the same way and go down that same path? Or do we try to protect the LibertyLink technology a little bit more. We need to make sure we are utilizing other modes of action and using pre-herbicides when we can to make sure we get the most of out of that system.”

There are no new technologies as far as weed control, so to me that says we need to protect the LibertyLink technology that much more.
“this LibertyLink technology is about as close as we are going to have that is close to RoundUp ready crops early on. We don’t need resistance developing, once we do, that is our last broad spectrum herbicide in a GMO crop.”

How many modes of action should a producer use?

“The number of modes of action a producer should use depends on the crop. Generally when you look at a corn or sorghum crop, you want to mix it up, it will probably be atrazine based but if you are in a GMO crop you want to have at least 2 modes of action, if not 3, and the same will hold true in soybeans. In cotton, you want to increase that number. Remember anything with a hood counts as a different mode.”

Explain why this is important:

“this is important because it shifts how we have to respond to the different types of control. So if a weed is controlled by the same mode of action over and over, it has the opportunity to evolve. But if you use more than one way of control, it takes the pressure off of one type of control. You might have one weed out ther that becomes resistant to a certain herbicide, but if you have a second one or a second method you will pick that weed up and it wont set seeds.” 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.