Shawna Hubbard

Shawna Hubbard is the herbicides product manager for Corteva Agriscience, Agriculture Division of DowDuPont. 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.

  • LOCATION
  • Indiana

  • ENLIST CROP
  • Soybeans
    Corn

  • PROBLEM WEEDS
  • Marestail
    Waterhemp
    Giant ragweed

  • MANAGEMENT PRACTICES
  • Program approach to weed management


Learning From Success in Cotton

The Enlist weed control system once again proved its worth in 2018. Cotton farmers continue to lead the way, adopting the technology successfully on a wide scale throughout the Cotton Belt. Enlist cotton was the first Enlist crop out of the gate, and our experiences with it provide a number of lessons for farmers planting Enlist E3 soybeans.

As we prepare for the third full commercial year of Enlist cotton, we’ve seen tremendous growth and successful use of Enlist herbicides. In 2018, we sprayed enough Enlist herbicides to cover 1.5 million acres of PhytoGen® W3FE cottonseed, which includes the Enlist trait. Enlist cotton acres tripled vs. 2017.

The Enlist team keeps learning from experiences in the South, and we’ll use that knowledge to help growers, applicators and retailers succeed with Enlist E3 soybeans.

One system, three herbicide tolerances
Like Enlist E3 soybeans, Enlist cotton features three herbicide tolerances: 2,4-D choline, glyphosate and glufosinate. Cotton growers are using Enlist One® and Enlist Duo® herbicides as cornerstones of a herbicide program approach. Growers who implement weed control programs delivering multiple modes of action not only obtain better weed control during the growing season but also help curb the development of resistant weeds in future years.

Tips for implementing the Enlist system in soybeans
With 2019 sales of Enlist E3 soybeans and a robust ramp-up plan for widespread availability of Enlist E3 soybeans starting in 2020, we’ve developed key takeaways to consider:

1. Develop and follow a weed resistance management plan. This involves using multiple herbicide modes of action to control tough weeds in the current year while curbing the ability of weeds to develop resistance to effective herbicides. We strongly urge farmers to adopt a program approach that takes advantage of several modes of action. 

2. Pay attention to field planning as you incorporate this new trait technology. When choosing which fields to plant with varieties containing the Enlist™ trait – or any herbicide trait – consider the surrounding landscape and any nearby susceptible crops or plants. 

3. Use the Enlist weed control system on areas of your operation that contain glyphosate-resistant weeds. 

4. Follow the label when applying Enlist herbicides. These products contain 2,4-D choline, which offers inherent low volatility, with Colex-D® technology for better handling and drift reduction. Always follow all label requirements for successful application. It’s critical to pay attention to wind speed and direction, equipment cleanout and environmental conditions. Farmers tell us when they follow the label, the system works. 

5. Fully utilize all trait tolerances. If you like glufosinate-tolerant soybeans, Enlist E3 soybeans are a natural next step. Farmers can tank-mix Enlist One herbicide with glufosinate or take advantage of the convenient blend of Enlist Duo herbicide to apply 2,4-D choline and glyphosate easily. 

6. Complete training before it’s time to spray. Farmers, applicators and retailers should find a training opportunity before using the Enlist™ weed control system. Visit the Enlist 360 training module to learn more.

You can evaluate new technology options and see how they fit your needs in your fields by better understanding how to use the technologies. The 2,4-D choline in Enlist herbicides is truly different from traditional forms of 2,4-D contained in other herbicides.

We’re very excited for the opportunities the Enlist weed control system and Enlist E3 soybeans can now provide farmers. We’re preparing the industry to succeed with these novel soybean varieties containing the Enlist trait. The entire Enlist team is committed to educating and training users how to incorporate the system confidently and successfully on their farms.


Scout, Identify and Plan to Contain Troublesome and Resistant Weeds

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.


Avoid crop damage: Clean the sprayer according to the herbicide label

Proper sprayer cleanout is vital. Thorough cleanout of the spray tank and nozzles is the first step to minimize the potential for sprayer contamination and damage to susceptible crops. Shawna Hubbard, herbicides product manager, urges applicators not to overlook this important task. 

“Often smaller, harder-to-see sprayer parts come in contact with herbicides,” Hubbard says. “Check hoses, screens, filters, pumps and dead ends on the boom. Clean these parts as well as the sprayer tank thoroughly.” Clean transfer equipment and pumps before switching to the next product.

Take time, triple-rinse
Triple-rinsing the sprayer and its components is a must after applying Enlist Duo® or Enlist One® herbicide to any crop other than glyphosate-tolerant corn. This helps ensure any remaining Enlist™ herbicides are removed from the system.

Rinse 1: Be sure to rinse the tank walls. 

1. Drain the spray system (including lines and boom) for no less than five minutes.

2. Fill the tank with clean water to at least 10 percent of the tank’s total water volume. The larger the sprayer tank, the more water you will need.

3. Circulate clean water through the system for at least 15 minutes.

4. Spray out the rinse solution through the boom/nozzles.

Rinse 2:

Completely drain the spray system, including lines and booms. Remember: Spray solution can be hard to drain from low-lying hoses and the dead ends of sprayer booms. Loosen and remove hoses and end caps to drain.

1. Remove and clean all filters and strainers. 

2. Fill the tank with clean water to at least 10 percent of the tank’s total water volume. 

3. If desired, add a commercial tank cleaner. Several products are approved for use with Enlist herbicides.

4. Circulate clean water through the system for at least 15 minutes.

5. Leave the solution in the system for several hours. Overnight is preferable if time allows. 

6. Spray out the rinse solution through the boom/nozzles. 

Rinse 3:

1. Completely drain the spray system, including lines and booms. 

2. Fill the tank with clean water to at least 10 percent of the tank’s total water volume. 

3. Circulate water through the system for at least 15 minutes.

4. Spray out the rinse solution through the boom/nozzles. 

5. Completely drain the spray system, and then remove and clean the nozzle tips and strainers separately.

Single-rinse before spraying glyphosate-resistant corn

A single-rinse is all that is necessary when your next application will be on glyphosate-tolerant corn. Use the steps listed in “Rinse 1” above. 

For more information about the Enlist system, contact your representative for Corteva™ Agriscience, Agriculture Division of DowDuPont.