This month EPA approved a new dicamba-based herbicide that can be used in Roundup Ready 2 Xtend soybean (dicamba/glyphosate-resistant soybean), which came to the market in the 2017 growing season. Tavium, a product of Syngenta,  is a premix of dicamba and S-metolachlor.

Three other dicamba-based products―Engenia, FeXapan, and XtendiMax―have been labeled and used by growers in the last couple of years.

Dicamba, a Group 4 herbicide, offers primarily foliar activity on broadleaf weeds and provides another site of action to control glyphosate-resistant broadleaf weeds. S-metolachlor, a Group 15 herbicide, provides residual weed control. (For more information on groups, see Herbicide Classification Chart.)

Tavium is a capsule suspension (CS) formulation containing 1.12 lbs of dicamba acid equivalent (ae) and 2.26 lbs of S-metolachlor per gallon. It can be applied pre-plant to post-emergence (up to V4 soybean growth stage or within 45 days after planting, whichever comes first) in Roundup Ready 2 Xtend soybean.

Maximum Single Application Rate: 56.5 fl oz/acre (equivalent to 0.5 lb dicamba ae/acre and 1.0 lb S-metolachlor/acre)

Maximum Annual Rate: 113 fl oz/acre/year

• DO NOT exceed 2.48 lb ai/acre/year of S-metolachlor-containing products.
• DO NOT exceed 2.0 lb ae/acre/year of dicamba-containing products.

DO NOT apply less than 56.5 fl oz of this product/acre (equivalent to 0.5 lb dicamba ae/acre and 1.0 lb S-metolachlor/acre).

DO NOT make more than one pre-plant or at-planting or pre-emergence application, and/or one post-emergence (in-crop) application.

DO NOT feed treated forage or hay to livestock for 30 days following a pre-plant, at-planting, or pre-emergence application.

DO NOT graze or feed treated forage or hay to livestock following a post-emergence application.

Pre-harvest Interval (PHI): 90 days

Prior to applying this product in the 2019 growing season and each growing season thereafter, applicator(s) must complete dicamba or auxin-specific training.

For more information, read the current product label.