Chemical Identification
Common Name
ethyl 2-chloro-5-[1,6-dihydro-5-methyl-6-oxo-4-(trifluoromethyl)pyridazin-1-yl]-4-fluorophenoxyacetate
ethyl [2-chloro-4-fluoro-5-[5-methyl-6-oxo-4-(trifluoromethyl)-1(6H)-pyridazinyl]phenoxy]acetate
Molecular Formula
Molecular Structure
Two studies were conducted in 2002 to evaluate flufenpyr-ethyl tank-mixed with glyphosate for morningglory control in Roundup Ready corn and soybean (Southern Illinois University Weed Research Annual Report, 2002). In the corn system, crop injury from flufenpyr-ethyl was 9-12% at 7 days after treatment (DAT). Injury decreased over time and no injury was observed from any treatment at 28 DAT. Tank-mixing flufenpyr-ethyl with Roundup UltraMax, which alone controlled 95% of waterhemp, 94% of ivyleaf morningglory and 99% of velvetleaf at 14 DAT, increased waterhemp and ivyleaf morningglory control to 97 or 99%. These values however were not always significant due to the high level of weed control provided by Roundup UltraMax alone. In the soybean system, soybean injury was 3% for treatments containing flufenpyr-ethyl at both 7 and 14 DAT; all crop injury had decreased by 28 DAT. The addition of flufenpyr-ethyl to Roundup UltraMax increased control of morningglory species throughout the treatment, with levels of control at 56 DAT ranging from 77 to 95% compared to 60% for Roundup UltraMax alone. The addition of flufenpyr-ethyl to Roundup UltraMax also increased control of velvetleaf at all timings by 18 to 27%. Complete control (99%) of common cocklebur was observed. No differences were observed in the level of weed control provided by flufenpyr-ethyl at 0.39 oz/A compared to the 0.5 oz/A rate.

Field trials conducted by the Southern Illinois University in 2000 showed that S-3153 at 20 g\ha plus adjuvant provided good (>90%) post-emergence control of Ipomoea spp, Abutilon theophrasti, Xanthium strumarium and Ambrosia artemisifolia at 28 days after treatment (DAT) with acceptable effects (5% or less) on corn. Weeds were 4-8" in height at application. The weed control efficacy was superior to that provided by Clarity (dicamba), Distinct (diflufenzopyr + dicamba) and Weedone (2,4-D) and superior overall to Accent (nicosulfuron), Aatrex (atrazine) and Beacon (primisulfuron). Initial corn damage was more severe than the standards but was largely outgrown by 28 DAT.
beans, dry beans, lima beans, maize , snap beans, soybeans, sugar cane


17 – 104 g ai/ha


Subchronic oral (90 d, rat): NOAEL = > 1,434 mg/kg/

Transport Information
Hazard Class:O (Obsolete as pesticide, not classified)

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Valent voluntarily cancels flufenpyr-ethyl registrations in USA


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