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| Publication Type:
| Refereed |
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| Author(s): | Warrant-Mueller, George W. |
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| Author Affiliation: | Res. Agron., Agric. Res. Serv., U.S. Dep. Agric., Natl. Forage Seed Prod. Res. Cent. |
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| Title: | Enhanced activity of single-isomer fenoxaprop on cool-season grasses |
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| Source: | Weed Technology. Vol. 5, No. 4, October-December 1991, p. 826-833. |
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| Publishing Information: | Champaign, IL: Weed Science Society of America. |
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| Keywords: | TIC Keywords: Fenoxaprop-ethyl; Lolium perenne; Festuca arundinacea; Resistance; Herbicides
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| Abstract/Contents: | 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 HOEe 46360 EW on 3.06-fold increase in activity of HOE 46360 EC suggests that the S(-) isomer somehow interferes with 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. |
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| Language: | English |
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| References: | 17 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Warrant-Mueller, G. W. 1991. Enhanced activity of single-isomer fenoxaprop on cool-season grasses. Weed Technol. 5(4):p. 826-833. |
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