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Experts answer key soybean herbicide questions

TAGS: Soybeans
Tom J Bechman sprayer in field
FOLLOW BURNDOWN LABEL: If you’re applying an Enlist herbicide as burndown and will plant Enlist beans, there’s no waiting period. If it’s a different form of 2,4-D, follow the label.
They answer some frequently asked questions about post products in soybeans including Enlist and Liberty.

Steve Snyder and Andy Carriger didn’t hesitate to answer questions from farmers and retailers during a virtual Enlist applicator training session. Both are Enlist field specialists with Corteva Agrisciences.

Here are answers to frequently asked questions.

What are the differences in the two Enlist herbicides?

Carriger: Enlist Duo is 2,4-D choline and glyphosate. Enlist One is straight 2,4-D choline. Both contain 1.0 pound per acre of actual 2,4-D as active ingredient at the recommended rate.

Snyder: If you skimp on rates and weeds slip through, that’s how we get weed resistance developing. We strongly encourage rates listed on the label. Also, Enlist One is intended to be used as a tank mix partner. There are currently 1,100 tank mix partners on the label, including adjuvants and other pesticides. You can apply Enlist up to three times per season, but we don’t recommend someone applying Enlist by itself three times. That would set the stage for weed resistance.

Which tolerance traits do E 3 soybeans contain?

Snyder: They have tolerance to 2,4-D choline, glyphosate and glufosinate, the active ingredient in Liberty. If you spray a dicamba herbicide on E 3 soybeans, they will die. If you spray Enlist herbicides over dicamba soybeans, you will wipe them out.

Can you spray any form of 2,4-D on E 3 soybeans?

Snyder: The only 2,4-D products approved for in-crop application over E 3 soybeans are the two Enlist herbicides containing 2,4-D choline. Choline is a different molecule than the amine or ester form of 2,4-D. It is much less volatile. Without it, we would not have the Enlist system.

You can use other forms of 2,4-D as a burndown. However, follow the waiting period specified on that product’s label before planting soybeans. There is no waiting period if you use Enlist as the burndown.

Can ‘droopy’ soybeans occur after applying Enlist?

Snyder: Yes. Soybeans metabolize the herbicide. If you see it, the product is working. It usually appears in 24 to 48 hours, and then disappears. There is no yield effect. You are more likely to see it during dry weather stress.

There have been a few reports of cupping symptoms like those caused by dicamba, even when no dicamba was sprayed nearby. How does this happen?

Carriger: There are only two ways to get cupping in Enlist soybeans if it’s not from spraying dicamba soybeans nearby. If a neighbor sprayed Status on corn, it has dicamba in it and could cause cupping in Enlist beans. Or else it’s contamination from the spray tank, such as if someone sprayed a dicamba burndown and didn’t clean the sprayer thoroughly.

Can Enlist and Liberty be tank-mixed together?

Snyder: Yes. We suggest using 15 gallons per acre of spray volume with Enlist herbicides, and 20 gallons per acre if Liberty is in the mix. You will also want to add AMS. Pick a nozzle that’s recommended and stay at the high end of the pressure range if Liberty is included. The goal with Liberty is to get good coverage because it’s a contact herbicide.

With dicamba herbicides, AMS is not labeled as a tank-mix partner. Be sure to follow the label precisely for the products you are applying.  

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