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Volunteer Wheat (Triticum aestivum) in Newly Seeded Alfalfa (Medicago sativa L.)

Published online by Cambridge University Press:  12 June 2017

Pablo M. Ott ,
Jean H. Dawson  and
Arnold P. Appleby
Pablo M. Ott
Affiliation:
Dep. Crop Sci., Oreg. State Univ., Corvallis, OR 97331
Jean H. Dawson
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Irrigated Agric. Res. Ext. Cent., Prosser, WA 99350
Arnold P. Appleby
Affiliation:
Dep. Crop Sci., Oreg. State Univ., Corvallis, OR 97331
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Abstract

Wheat that emerged with alfalfa seeded in the field in late August grew for 20 days after planting without suppressing the alfalfa but reduced yields if allowed to grow with alfalfa for 30 or more days. Uncontrolled wheat reduced the first cutting yield of alfalfa by 80% or more. Sethoxydim at 0.4 kg ai/ha, fluazifop at 0.2 kg ai/ha, and haloxyfop at 0.2 kg ai/ha controlled wheat selectively in alfalfa. Herbicides applied 20 days after seeding protected alfalfa from suppression by wheat. Control of wheat was equal when herbicides were applied 30 days after seeding, but in 1 of 2 yr, the wheat had suppressed the alfalfa enough to reduce yields the following May.

Keywords

Fluazifop, butyl ester of (±)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]-oxy)phenoxy] propanoic acidhaloxyfop, methyl ester of 2-[4-[[3-chloro-5-(trifluoromethyl)-2-pyridinyl]-oxy)phenoxy] propanoic acidsethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onealfalfa, Medicago sativa L.wheat, Triticum aestivum (L.)em. ThellCompetitioninterferenceallelopathyfluazifophaloxyfopsethoxydim
Type
Research
Information
Weed Technology , Volume 3 , Issue 2 , June 1989 , pp. 375 - 380
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

Literature Cited

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