As breakthroughs in weed control technology continue to rock the market, Corteva’s Enlist One® and Enlist Duo® are seeing increased adoption. With label restrictions limiting dicamba tank mix ingredients and the EPA tightening regulations on application timing and buffer zone establishment, more growers are switching to Enlist One and Enlist Duo to avoid these negatives of dicamba. As more growers make the change, choosing the right adjuvants to use with Enlist One and Enlist Duo is key to ensuring optimum weed control.
The soybean field in this photo has cupped leaves, which is a symptom of dicamba exposure. The dicamba likely volatilized, drifting from a neighboring field that was treated with the herbicide.
Enlist One is a 2,4-D choline herbicide that significantly reduces the risk of volatility compared to other herbicides, such as dicamba. The reduced volatility of Enlist One means that a different set of adjuvants is needed to ensure efficacy. Corteva has a testing protocol to approve adjuvants for use with Enlist One and Enlist Duo. This ensures that farmers are using the right adjuvants to get the best results.
Enlist One is a 2,4-D choline herbicide that can be used as a post-emergence herbicide on Enlist corn, soybeans, and cotton. It works by mimicking the naturally occurring plant auxins, which overloads the plant’s auxin balance and affects vital processes such as cell division and elongation, resulting in abnormal growth and plant death. Enlist herbicides with Colex-D® technology are the only 2,4-D-containing products authorized and specifically labeled for use with Enlist crops.
Enlist Duo is a combination of 2,4-D choline and glyphosate herbicide that can be used to control emerged annual and perennial weeds, including broadleaf and grassy weeds. Like Enlist One, Enlist Duo uses 2,4-D as an active ingredient, however, Enlist Duo also adds glyphosate as a second active. Glyphosate works by targeting an enzyme that is essential for plant growth. Enlist Duo is designed for corn, soybean, and cotton crops containing Enlist traits, which are patented genes that provide tolerance to Enlist Duo.
Adjuvants can be tank-mixed with Enlist One and Enlist Duo to improve their performance. They can do this in several ways, including:
The labels for Enlist One and Enlist Duo list a number of adjuvants that are recommended for use with these herbicides. These include:
In addition to these basic adjuvants, there are several multifunctional adjuvants that are also approved for use with Enlist One and Enlist Duo. These adjuvants combine the benefits of two or more different adjuvants in a single product.
Use the links below to access the complete list of adjuvants for Enlist One and Enlist Duo.
The labels for Enlist herbicides recommend taking steps to avoid drift, such as using low-pressure nozzles and applying the herbicide when winds are calm. In addition to these steps, adding drift control and deposition aids to the tank mix can help to reduce the risk of drift and damage to surrounding areas.
Exacto manufactures a broad range of adjuvants that are approved for use with Enlist herbicides. These adjuvants include AMS-based adjuvants with drift control, oil-based water conditioners with drift control, and water conditioners with NIS and drift control. Exacto also has a formulation with patented Penetration Factor technology that delivers drift control but also can overcome herbicide antagonism in one tank mix and reduce the need for ammonium sulfate.
Many of our adjuvants have been rigorously field-tested, and their efficacy has been proven in independent trials. For example, as shown in the graph 1 below, a field trial showed that our multifunctional adjuvant containing nonionic surfactant, water conditioner, drift control, and patented Penetration Factor improved Palmer amaranth control as good as or better than AMS at 3 lbs/A. The adjuvant improved weed control and delivered convenience by making tank mixing easier and reducing the need to haul and store heavy AMS bags.
Graph 1: SYNTHEX L 941 (NIS – WC – DC) improves efficacy of complex tank mixes with Enlist One and other pesticides compared to AMS alone at various rates. Tank mix contains: Enlist One: 0.75 pt/A; Roundup PowerMAX 14 oz/A; Liberty 280 SL: 14 oz/A at 15 gal/A; various rates of AMS; SYNTHEX L 941 at 0.5% v/v. Nozzle used AIXR 11015 @ 40 PSI. 14 DAA
When tank-mixing clethodim and 2,4-D, grass control by clethodim is significantly reduced. The addition of a modified-seed-oil-based activator adjuvant with water conditioner and drift control overcomes this antagonism and allows for one effective application to reduce Enlist volunteer corn in a soybean field together with broad leaf weed control (see graph 2). Having volunteer corn not only can affect the actual yield but also prevent contamination and increase yield quality.
This soybean field is a real-world example of the antagonism. This was taken over a week after a reapplication of
2,4-D and clethodim on a bean field, with no adjuvant.
Graph 2: TOLEX MEC 6050 overcomes antagonism in a tank mix with 2,4-D choline and clethodim and delivers better volunteer corn control than doubling the rate of clethodim. Tank mix contains: Enlist One 32 fl.oz./A; Select Max at 4 or 8 fl.oz./A. 21 DAA
When choosing adjuvants for Enlist herbicides, it is important to consult the herbicide label to see which adjuvants are approved for use. It is also important to follow the instructions on the label for mixing and applying the adjuvants.
By following these steps, you can help to ensure that Enlist herbicides are used safely and effectively, and that the risk of drift is minimized.
The best way to choose the right adjuvants for Enlist One and Enlist Duo is to consult the label for the specific herbicide being used. The label will list the adjuvants that are approved for use with that herbicide.
In addition to the information on the label, it is also important to consider the specific conditions in which the herbicide will be applied. For example, if the water is hard, an AMS adjuvant may be necessary to improve the solubility of the herbicide. If the weeds are large or have a waxy cuticle, a COC or HSOC adjuvant may be helpful in improving penetration.
Adjuvants are an important part of using Enlist One and Enlist Duo effectively. By choosing the right adjuvants and using them at the recommended rates, farmers can help to achieve optimal weed control.
Here are some additional tips for choosing the right adjuvants for Enlist One and Enlist Duo:
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A field full of volunteer corn that could have benefitted from a successful 2,4-D application
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