No Mixed Results: Tank Mixing Is Effective

Tank mixing is a common practice in agriculture for addressing multiple weed species in a timely manner

Loading tank mix into sprayer, Illinois

The current label for XtendiMax® herbicide with VaporGrip® Technology (Restricted Use Pesticide) allows for tank mixing a list of approved products, including glyphosate-based herbicides such as Roundup PowerMAX® herbicide. Farmers have found this combination to be an effective application for addressing broad-spectrum control of multiple grasses and broadleaf weeds.

Bayer implemented a proactive process through which tank-mix products are tested for volatility potential. This process helps to ensure that tested products do not adversely affect the volatility potential of XtendiMax with VaporGrip Technology. In 2018 field testing, the common tank mix of XtendiMax with VaporGrip Technology + Roundup PowerMAX + Intact™ (a drift-reducing adjuvant) was tested to evaluate volatility potential under varying conditions in six states.

This same tank mix was also extensively evaluated by the Environmental Protection Agency (EPA) in its most recent assessment of XtendiMax with VaporGrip Technology prior to re-registering the herbicide in November 2018. The EPA's assessment also considered extensive field trial research conducted by several academic partners during the 2018 growing season. These academic trials were conducted using the tank mix of XtendiMax with VaporGrip Technology + Roundup PowerMAX + Intact™.

The EPA has evaluated Bayer's research, as well as independent research of academic partners, which confirms that XtendiMax with VaporGrip Technology tank mixes with potassium salt (K-salt) formulations of glyphosate, such as Roundup PowerMAX (in accordance with those tank-mix partners listed on the website), do not increase volatility potential in a way that would impact plants outside of the field.

The use of approved glyphosate herbicide tank-mix products is required to include an approved drift reduction adjuvant and meet Bayer's standard for low volatility. IPA salt glyphosates, on the other hand, have a higher potential to impact volatility; as a result, they are prohibited from being used as tank-mix partners. Other additives such as ammonium salts, including ammonium sulfate and ammonium nitrate, are also prohibited from the tank mix because of significant increase in volatility potential.

Visit for an approved list of tank mixes.

Related Content


Plan for 2020 Dicamba Training

As farmers and applicators prepare for the 2020 season, a refresher course on the XtendiMax with VaporGrip Technology label and application requirements will be beneficial.

Learn More

Five Questions About Dicamba With a Custom Applicator

Today's Acre caught up with Jim Cook before the 2019 spraying season began to get his thoughts on dicamba applications.

Learn More

Good Stewardship, Good Control

Giant ragweed, marestail, waterhemp and Palmer amaranth are the weeds driving farmers in Missouri, southern Iowa, eastern Kansas and northeast Arkansas to new technologies for control measures.

Learn More

Look Inside

To see more stories and features, download the full issue.

Download the Full Issue