Flexstar GT 3.5 - Herbicide | Syngenta


Flexstar GT 3.5 Videos

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Product Overview

Flexstar® GT 3.5 herbicide is specifically formulated to combat weeds in cotton and soybeans that are difficult to control with glyphosate alone or are resistant to glyphosate and ALS-inhibitors.  It contains two leading active ingredients, glyphosate and fomesafen, and delivers two different modes of action. Flexstar GT 3.5 also contains Isolink® II Technology, a unique adjuvant system designed to optimize the systematic activity of glyphosate and the contact activity of fomesafen. 

Product Highlights

  • Offers post-emergence protection from weeds that are difficult to control with glyphosate alone
  • Combines two leading active ingredients and delivers two different modes of action for better control than glyphosate alone
  • Enables you to target difficult-to-control weeds that have developed or are likely to develop resistance to glyphosate and/or ALS-inhibitors
  • Utilizes the Isolink II Technology adjuvant system for improved effectiveness and reduced crop injury


“Flexstar GT 3.5 herbicide keeps our fields clean. I only sprayed one time this year. The residual control was great – we got about 30 days and by that time, the rows had closed up and none of the bad weeds could grow.” Austin Carlson, Grower, Quimby, IA

“We’ve applied Flexstar GT 3.5 herbicide as an early post-emergence herbicide on our soybeans. It’s great on giant ragweed, which is always tough to control in our area. It’s done a great job cleaning up our fields.”  - Ryan Larson, Grower and retailer, Blooming Prairie, MN

Download Supporting Flexstar GT 3.5 Documents

20189720183819515_Flexstar GT 3.5 Snip.JPG PDF
Flexstar GT 3.5 Sell Sheet(PDF)
20162282016526232834_soybean-herb-sell-thumb.jpg PDF
Soybean Herbicide Portfolio Sell Sheet(PDF)
20167572016315214512_Boundary-Flexstar.jpg PDF
Boundary-Flexstar GT 3.5 Sell Sheet(PDF)

Target Difficult-to-Control Weeds with Flexstar GT 3.5

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Flexstar GT 3.5 - Carousel, Chart
Flexstar GT 3.5 - Carousel, Chart
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This image series shows the superior weed management provided by Boundary® followed by Flexstar® GT 3.5 (right) vs. untreated (left) and Fierce® (center). Source: Syngenta, 2016.

The effectiveness of a strong full-season weed management program is even more apparent during bare ground trials, as shown here. Top left: No pre-emergence herbicide with a post-emergence application of Flexstar® GT 3.5. Top right: Envive® followed by Flexstar GT 3.5. Bottom left: Valor® followed by Flexstar GT 3.5. Bottom right: Boundary® followed by Flexstar GT 3.5. Source: Syngenta Grow More™ Experience site, 2016; Kinston, NC.

One of the keys to weed resistance management is the use of multiple effective sites of action. The difference in weed control is clear when comparing a glyphosate-only application (left) to the 2 effective sites of action of Flexstar GT 3.5 (right). Source: Syngenta, 2013.


Mar 29, 2016

Palmer amaranth among soybean weeds expected to be major challenge in 2016

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