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Sensitivity of Fieldbeans (Phaseolus vulgaris) to Reduced Rates of 2,4-D and Dicamba

Published online by Cambridge University Press:  12 June 2017

Drew J. Lyon  and
Robert G. Wilson
Drew J. Lyon
Affiliation:
Dep. Agron., Univ. Nebraska, Scottsbluff, NE 69361
Robert G. Wilson
Affiliation:
Dep. Agron., Univ. Nebraska, Scottsbluff, NE 69361
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Abstract

The effects of the dimethylamine salt of dicamba (3,6-dichloro-2-methoxybenzoic acid) and the dimethylamine salt of 2,4-D [(2,4-dichlorophenoxy)acetic acid] on fieldbeans (Phaseolus vulgaris L. ‘Great Northern Valley’) were studied in order to assess the potential hazards of using these herbicides in areas adjoining fieldbean production. Dicamba and 2,4-D were applied to fieldbeans at three different rates (1.1, 11.2, and 112.5 g ai/ha) and four different growth stages (preemergence, second trifoliolate leaf, early bloom, and early pod). Application of 2,4-D preemergence or in the second trifoliolate leaf stage of growth did not reduce seed yield, delay maturity, or reduce germination of seed obtained from treated plants. Dicamba or 2,4-D applied at 112.5 g/ha to fieldbeans in the early bloom or early pod stages of growth consistently reduced seed yield, delayed maturity, and reduced germination percentage. Fieldbeans exhibited a greater overall sensitivity to dicamba than to 2,4-D.

Keywords

Dry edible beansherbicide driftseed qualityprogeny germination and vigor
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 34 , Issue 6 , November 1986 , pp. 953 - 956
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

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