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Phytotoxicity and Yield Response of Broad Bean (Vicia faba) to Glyphosate

Published online by Cambridge University Press:  12 June 2017

J. Mesa-García ,
A. De Haro  and
L. García-Torres
J. Mesa-García
Affiliation:
Dep. of Plant Protection, INIA, Apdo. 240, Córdoba, Spain
A. De Haro
Affiliation:
Dep. of Plant Protection, INIA, Apdo. 240, Córdoba, Spain
L. García-Torres
Affiliation:
Dep. of Plant Protection, INIA, Apdo. 240, Córdoba, Spain
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Abstract

The tolerance of broad bean (Vicia faba L. Moruna and Alameda) to glyphosate [N-(phosphonomethyl)glycine] was studied under field conditions. Chlorosis, rolling of apical leaves, and reduced growth were the typical symptoms caused by glyphosate on broad bean plants. Visual phytotoxicity from glyphosate at 60 and 120 g ae/ha was very slight. Moderate or severe crop injury was caused by glyphosate at 360 and 600 g ae/ha, when applied before blooming. Seed yields were 2, 4, 9, 23, and 47% lower than the control after glyphosate applications at 60, 120, 240, 360, and 600 g ae/ha, respectively, when averaged over stages of growth and locations. Broad bean was more susceptible to glyphosate at the vegetative stage, when the plants had five to seven nodes, and less susceptible at the late-flowering and pod-bearing stage. Double applications of glyphosate at 120 g ae/ha reduced seed yield more than 10% compared with similar treatments at 60 g ae/ha, regardless of growth stage. Glyphosate decreased seed yields mainly by reducing the number of pods per plant, but germination, fiber content, and gross energy of the seeds were not altered.

Keywords

Orobanche crenataparasitic weedscrop responseORACR
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 32 , Issue 4 , July 1984 , pp. 445 - 450
Copyright
Copyright © 1984 by the Weed Science Society of America 

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References

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