Numerous new premixtures dominate the herbicide market for corn and soybeans in 2020. These are all new mixtures of existing active ingredients already registered for corn or soybeans. Most of the new products contain at least one active ingredient offering residual control. As in the past decade or so, control of glyphosate resistant Palmer amaranth and common waterhemp drive trait selection and weed management systems.

Valent

Valent received registration this spring for Perpetuo®, a premix product combining the residual prowess of pyroxasulfone (Group 15 herbicide) with the burndown properties of flumiclorac (Group 14 herbicide). Valent promotes the use of Perpetuo as a post-applied product with enough residual to ensure excellent weed control up to canopy closure. Perpetuo is labeled for both corn and soy.

Corteva

Corteva’s Enlist E3® soybean varieties are widely available for the 2020 season. Enlist soybeans tolerate pre- and post-applications of Corteva’s proprietary low volatility formulation of 2,4-D (2,4-D choline with Colex-D® technology). Enlist Duo® 3.38L is a premix of 2,4-D choline plus glyphosate and Enlist One® 3.8L is a stand-alone 2,4-D choline formulation. Enlist varieties are also tolerant of glufosinate. No other types of 2,4-D are registered for use in the Enlist trait system! As with the Xtend cropping system, growers are required to pass a certification test. Check out the Enlist web site for training requirements, application requirements and legal tank mixtures at https://www.enlist.com/en/herbicides.html.

Bayer

The biggest news for those soybean growers using the Roundup Ready 2 Xtend® trait is the availability of XtendFlex® soybeans, bringing glufosinate resistance into the trait, along with glyphosate and dicamba. XtendFlex beans have been fully registered in the US for a couple of years now and has export approval everywhere but Europe, which is expected this summer. Varieties are limited.

Remember that dicamba formulations registered for use in the Xtend system are Restricted Use Pesticides, requiring special dicamba-specific training annually for use and purchase. Growers should check the website for each of the manufacturers before herbicide application.

BASF offers the LL GT27® soybean trait, which provides tolerance to glyphosate, glufosinate and isoxaflutole (an HPPD herbicide, Group 27). This is the first soybean trait with this site of action. The only HPPD herbicide registered for use in this trait system is Alite 27®, and only small quantities are available for 2020. Isoxaflutole has been used successfully in corn for many years.

Alite 27 is a restricted use pesticide for use in a very limited geography (because of potential for groundwater contamination and exposure to certain endangered species). LL GT27 soybeans are available through several different seed companies. Farmers should check the website for each of the manufacturers, before application.

BASF positions Alite 27 as the ideal foundation herbicide for soybeans in geographies, especially those facing the challenges of glyphosate-, ALS-, and PPO inhibitor weed resistance concerns. In addition to offering residual weed control of annual grasses and broadleaf weeds, isoxaflutole can “recharge” with additional rainfall, killing small weed seedlings.

Innovation drives adoption and the herbicide space has seen plenty of both recently. Whether you go with the options listed above, or consider another entirely, you’ll be helping to provide safe, reliable care for your fields.

-Jeff Travers, IN10T Agronomist