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Environmental Modification of Seedling Alfalfa, Medicago sativa, Tolerance to Bromoxynil

Published online by Cambridge University Press:  12 June 2017

Esther K. Peregrine  and
Robert F. Norris
Esther K. Peregrine
Affiliation:
Bot. Dep., Univ. California, Davis, CA 95616
Robert F. Norris
Affiliation:
Bot. Dep., Univ. California, Davis, CA 95616
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Abstract

Seedling alfalfa exhibited increased phytotoxicity from bromoxynil when applications were made with temperatures greater than 28 C both in controlled environments and in the field. Treatments applied in the morning were more phytotoxic than treatments made in the late afternoon. In laboratory experiments, inhibition of oxygen evolution occurred within 1 h after treatment. The amount of permanent damage sustained was dependent on the rate of bromoxynil and the length of time the alfalfa was exposed to light or darkness immediately after spraying. Bromoxynil treatments in cool weather and/or in the late afternoon should minimize injury to the crop.

Keywords

Alfalfa, Medicago sativa L. Moapa 69bromoxynil, 3,5-dibromo -4-hydroxybenzonitrileTime-of-day at applicationtemperaturelightphytotoxicity
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 36 , Issue 5 , September 1988 , pp. 671 - 677
Copyright
Copyright © 1988 by the Weed Science Society of America 

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