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The FMC Upside

Use of Foliar PPOs in the Absence of Dicamba

Read the entire report from

our technical services team


Many in the agricultural community were surprised to hear that the 9thCircuit Court overturned the EPA’s decision on sale of low volatility dicamba products like XtendiMax®, FeXapan®, Tavium® and Engenia® herbicides.

With no certainty about the future of this product, many retailers, agronomists and growers may be looking for alternatives to dicamba for their weed control needs.

While dicamba was a welcomed tool in soybean weed management, there are options with historical success that are viable for growers today. In fact, there is a plethora of research that strongly condemns the over-reliance on systemic POST herbicides like dicamba and glyphosate.

PPOs have long dominated the weed control market in soybeans. It was the simplicity, complete crop safety and efficacy of glyphosate in GT soybeans that started the recent trend toward systemic chemistries but, alas, resistance and legal issues have prompted us to consider legacy options.

The Foliar PPO Conversation

Common Perception Reality
PPOs are great PRE herbicides, but they are not good POST. Certain PPOs do make great PRE residual herbicides. Authority®brands continue to be the market leader in soybean chemistries. However, PPOs are comprised of several chemical families and, like all chemistries, they must be utilized and managed differently. Applied correctly, PPO chemistry can be utilized POST to control pigweeds, nightshades, ragweeds, lambsquarters, velvetleaf and many others.
Foliar PPOs hurt soybeans Foliar PPO chemistries are considered photodynamic and can result in some necrotic speckling on the leaves. This is purely cosmetic. Plants will recover in a short time, and yields will not be negatively impacted.
PPOs cannot be used as a rescue treatment effectively No herbicide should be considered a “rescue treatment.” The data is clear that overlapping residual herbicides and controlling weeds before they emerge is the best method of obtaining optimal control and slowing resistance. Using PPO's as an early post (2-4" tall weeds) is the most effective way to get the desire control.
PRODUCT Anthem® Maxx Insecticide Cadet® Herbicide Marvel™ Herbicide
Active Ingredients Pyroxasulfone (15) + fluthiacet methyl (14) Fluthiacet methyl (14) Fomesafen (14) + fluthiacet methyl (14)
Type of Control Residual and contact control Contact control with low use rate Residual and contact control
Application Timing Preplant V6 Preplant – (full flowering) R2 Preplant full flowering stage of development (prior to R3 stage)
Usage Rate 2.5 fl. oz.-5.5 fl.oz./A 0.9 fl. oz./A 7.25 fl. oz./A

Hero® insecticide can be added to any of the above post herbicide products at 5 fl. oz/A for control of stink bugs, podworms, thistle caterpillar, grasshoppers, Japanese beetles, bean leaf beetles, and others.

To see trial comparison photos and tips for best product usage, download the full report. 

Hero insecticide, XtendiMax, FeXapan, Taviumand Engeniaherbicides are Restricted Use Pesticides. Always read and follow all label directions, precautions and restrictions for use. Some products may not be registered for sale or use in all states. Authority Edge herbicide may not be registered for sale or use in all states. Contact your local FMC retailer or representative for details and availability in your state. FMC,the FMC logo, Anthem, Authority, Cadet, Hero and Marvel are trademarks and HatchTrakis a service mark of FMC Corporation or an affiliate. Flexstarand Taviumare trademarks of Syngenta Group Company. Roundup, Roundup PowerMaxand XtendiMaxare trademarks of Bayer CropScienceor an affiliate. Engeniaand Poastare trademarks of BASF. FeXapanis a trademark of DuPont, Dow AgroSciences and Pioneer and affiliated companies or their respective owners. Select and Select Max trademark of Valent U.S.A. Corporation. ©2020 FMC Corporation. All rights reserved. 20-FMC-2843 06/20

more inside this issue

Find insights on the use of foliar PPOs in the absence of Dicamba, Anthem® MAXX, Cadet® and Marvel™ herbicides.