Prefix - Herbicide | Syngenta


Prefix Videos


Prefix Videos

Product Overview

Prefix® herbicide offers the proven performance of fomesafen combined with S-metolachlor for superior management of grass and broadleaf weeds in soybeans and cotton. Its extended residual activity helps to maintain clean fields and increase yield potential throughout the season.

Application flexibility enables Prefix to be applied either pre-emergence or early post-emergence in soybeans. Boundary® herbicide can be used as a pre-emergence treatment when used in a system with Prefix in soybeans.

Dicamba Herbicide Tank-Mix Option

Prefix is one of several Syngenta herbicide tank-mix options available for inclusion with XtendiMax® with VaporGrip® Technology, Engenia® herbicide and FeXapan herbicide Plus VaporGrip Technology. Tank mixing with dicamba provides you with additional weed management options and resistance management benefits. Please visit the XtendiMax application requirements, Engenia tank mix and FeXapan tank mix pages for approved drift reduction agents.

Product Highlights

  • Provides timely weed management using 2 different sites of action to manage key ALS- and glyphosate-resistant weeds
  • Delivers extended residual activity against key grass and broadleaf weeds
  • Offers flexibility of pre- or early post-emergence application in soybeans
  • Provides excellent crop safety
  • Is available as a dicamba herbicide tank-mix option, expanding options for weed resistance management


Jim Campion
Stark County, IL

Jim Campion

“With Prefix herbicide, we can see 21 days on post-emergence if weather conditions are right.”

Tim Bennett
Bowling Green, MO

Timothy Bennett

“Adding Prefix herbicide to our program has made all the difference in trying to control late-season, late-germinating weeds.”






Download Supporting Prefix Documents

20162282016526232834_soybean-herb-sell-thumb.jpg PDF
Soybean Herbicide Portfolio Sell Sheet(PDF)
2016431201639214823_Prefix.jpg PDF
Prefix Technical Bulletin(PDF)


Jan 30, 2018

Syngenta stresses the importance of a start-clean, stay-clean approach to manage resistant marestail

Marestail, also known as horseweed, is top of mind for many corn and soybean growers preparing for the 2018 growing season.Read more »

Jan 25, 2018

Syngenta herbicides cleared for tank mixes on Roundup Ready 2 Xtend® soybeans and Bollgard II® XtendFlex® cotton

Syngenta has received confirmation from the Environmental Protection Agency (EPA) that several Syngenta herbicide tank-mix options have been cleared for inclusion with both XtendiMax® with VaporGrip® Technology and Engenia® herbicides.Read more »

Jan 16, 2018

Syngenta and university researcher offer key strategies for managing resistant weeds

In the battle against herbicide-resistant weeds, university and industry research has cast doubt on common assumptions and is rewriting some of the "rules" for managing resistant weeds.Read more »

CP Products