Weeds continue to develop resistance to herbicides. Farmers have been asking for new solutions. Steve Snyder, Enlist® field specialist, says the Enlist® weed control system is giving farmers more ways to overcome their weed issues.
“Farmers can use herbicides that feature multiple sites of action to control tough and resistant weeds,” Snyder says. “Enlist E3 soybeans are tolerant to three postemergence herbicides that feature different sites of action: 2,4-D choline, glyphosate and glufosinate – the active ingredient in Liberty herbicide.”
Snyder suggests adopting a program approach that first recognizes the weed challenges in a given field. The farmer can choose herbicide options that are effective against the weed species in that field.
“Try to start clean and stay clean,” he says. “Use a burndown or tillage for early-season weed control. Then apply preemergence herbicides, making sure to include a product or products with residual activity to keep weeds at bay as long as possible.”
Next choose an effective postemergence program.
“The Enlist weed control system allows farmers to employ multiple sites of action postemergence on Enlist crops,” Snyder says. “This not only helps control tough and resistant weeds during the growing season but also helps retard the development of resistant weeds.”
Farmers who plant Enlist E3 soybeans can apply Enlist Duo® and Enlist One® herbicides postemergence to control difficult, resistant weeds. Inherently low volatility 2,4-D choline is the key ingredient in Enlist Duo and Enlist One®herbicides.
“Growers who plant Enlist E3 soybeans can apply Enlist Duo, a convenient blend of 2,4-D choline and glyphosate,” Snyder says. “Or they can tank-mix Enlist One, a straight-goods 2,4-D choline, with qualified products, including Liberty herbicide. Both options provide multiple levels of protection against tough weeds. Users gain convenience and flexibility with Enlist herbicide options.”
The industry-leading triple herbicide tolerance trait gives farmers more choices and flexibility. This system provides a vital new option for controlling tough weeds in soybeans while helping address herbicide resistance.
“The first call should be to your seed dealer,” Snyder says. “Find out what E3 varieties they have available.”
In 2020, Enlist E3 soybeans will be available from all Corteva Agriscience seed brands. In addition, Corteva has been working with other seed providers. More than 100 companies are licensing the Enlist technology and bringing Enlist E3 soybeans to customers. This means, going forward, there will be more options for farmers to get the weed control solutions they need.
Scouting fields can help you make profitable decisions for next year. Take note of weed escapes and update weed management plans to control them. Weeds such as waterhemp, marestail, giant ragweed, Palmer amaranth and others may require a change in your herbicide program to improve weed control and limit the opportunities for these weeds to develop resistance to effective herbicides.
The Enlist™ weed control system works with a herbicide program approach that can take advantage of multiple modes of action to control tough weeds and curb opportunities for resistance.
Residual herbicides are key to start the season right. They help control weeds early in the season, letting the crop get off to a good start, which helps maximize yield potential. In addition, they are the first step in implementing multiple modes of action on the acre. Farmers can follow residual treatments with postemergence applications of Enlist Duo® herbicide and/or Enlist One® with qualified tank-mix partners.
Enlist Duo is a convenient combination of 2,4-D choline and glyphosate. Enlist One is a straight-goods 2,4-D choline that offers additional tank-mix flexibility. Farmers who plant Enlist corn also can use FOP herbicides for an additional effective mode of action on unwanted grasses or volunteer corn without the Enlist trait. Meanwhile, Enlist E3® soybeans are tolerant to glufosinate, which can be used in a tank mix with Enlist One herbicide.
It’s important to scout fields regularly all season long and watch for weed escapes. Resistant weeds often appear as patches in fields. Identifying these areas early helps prevent widespread distribution of seeds from the resistant population. If live weeds are growing next to dead weeds and they are of similar size, the surviving weeds may be resistant to the herbicide used in the field.
When you identify resistant weeds, try to control them as quickly as possible, preferably before harvest, when the combine may spread them throughout a larger area of the field. Then develop your weed management plan for the next year to apply effective herbicides that can stop these resistant weeds from further development. You can take advantage of the Enlist weed control system to help curb the spread of glyphosate-resistant and other tough weeds.
Steve Snyder is an Enlist® field specialist and serves as the in-field expert for the Enlist weed control system in the upper Midwest, including the Dakotas and Minnesota. His area includes a large number of soybean acres. Steve has more than 30 years of experience in crop protection for Dow and Corteva Agriscience. Snyder and other Enlist field specialists are experts in weed management, application technology and crop research.
Shawna Hubbard is the herbicides product manager for Corteva Agriscience. Her work with the Enlist™ weed control system involves helping inform and educate farmers, retailers and seed brands about the Enlist technology. Well versed in both Enlist traits and herbicides, Hubbard has been instrumental in developing and spreading stewardship messages and best management practices for the Enlist system.