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Evaluation of Early-Season and Postharvest Herbicide Treatments on Alfalfa (Medicago sativa)

Published online by Cambridge University Press:  12 June 2017

Kimberly T. Winton  and
Jimmy F. Stritzke
Kimberly T. Winton
Affiliation:
Dep. Agron., Oklahoma State Univ., Stillwater, OK 74078
Jimmy F. Stritzke
Affiliation:
Dep. Agron., Oklahoma State Univ., Stillwater, OK 74078
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Abstract

Terbacil (3-tert-butyl-5-chloro-6-methyluracil), diuron [3-(3,4-dichlorophenyl)-1,1-dimethylurea], hexazinone [3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1H,3H)-dione], and metribuzin [4-amino-6-butyl-3-(methylthio)-as-triazin-5(4H)-one] controlled palmer amaranth (Amaranthus palmeri S. Wats. ♯ AMAPA) in established alfalfa (Medicago sativa L.) when applied after first harvest. However, these same herbicides did not control palmer amaranth when applied early-season in March. Alfalfa forage yields were increased when palmer amaranth was controlled. Residue levels of terbacil and its metabolites in alfalfa forage from plots treated postharvest with 1.1 kg/ha of terbacil were well below the 5-ppm tolerance level established for terbacil in alfalfa. There was some chlorosis of alfalfa foliage following the postharvest use of the 1.1 kg ai/ha of terbacil. There was also a yield reduction of alfalfa in two of the six experiments (one from a March and one from a June application) where 1.1 kg ai/ha of terbacil was evaluated.

Keywords

Palmer amaranthdiuronhexazinonemetribuzinterbacilAmaranthus palmeriAMAPA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 33 , Issue 5 , September 1985 , pp. 708 - 713
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

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