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Enhanced Activity of Single-Isomer Fenoxaprop on Cool-Season Grasses

Published online by Cambridge University Press:  12 June 2017

George W. Mueller-Warrant
George W. Mueller-Warrant*
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Natl. Forage Seed Prod. Res. Cent., 3450 SW Campus Way, Corvallis, OR 97331-7102
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Abstract

Formulations of fenoxaprop enriched in the R(+) isomer, HOE 46360-08H EW (described as an emulsifiable water-based formulation) and HOE 46360-05H EC (emulsifiable concentrate), were compared with the commercial racemate EC for control of roughstalk bluegrass and tolerance of perennial ryegrass and tall fescue grown for seed. The enriched EW and EC formulations were more than twice as active as the racemate per kg total fenoxaprop, despite enrichment to only 92 and 89% R(+) isomer purity, which should have increased activity by 1.84- and 1.78-fold, respectively. Increased activity was evident both as improved weed control and as decreased crop tolerance. Although the 3.69-fold increase in activity of HOE 46360 EW on roughstalk bluegrass relative to the racemate may be partly due to changes in the emulsion, the 3.06-fold increase in activity of HOE 46360 EC suggests that the S(-) isomer somehow interferes wih the activity of the R(+) isomer. Use of 280 g ai ha–1 of the racemate could be replaced with 76 g ha–1 of the EW or 92 g ha–1 of the EC formulation of HOE 46360 for equivalent roughstalk bluegrass control, but with decreased crop tolerance in perennial ryegrass and tall fescue.

Keywords

Fenoxaprop (±)-2-[4-[(6-chloro-2-benzoxazolyl)oxy]phenoxy]propanoic acidHOE 46360-05HHOE 46360-08Htall fescue, Festuca arundinacea Schreb. ♯3 FESARperennial ryegrass, Lolium perenne L. ♯ LOLPEroughstalk bluegrass, Poa trivialis L. ♯ POATRGrass seed productionracemateFestuca arundinaceaLolium perennePoa trivialisFESARLOLPEPOATR
Type
Research
Information
Weed Technology , Volume 5 , Issue 4 , December 1991 , pp. 826 - 833
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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