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Influence of Phenoxy Herbicides on Picloram Uptake and Phytotoxicity

Published online by Cambridge University Press:  12 June 2017

A. S. Hamill ,
L. W. Smith  and
C. M. Switzer
A. S. Hamill
Affiliation:
Dep. of Bot., Univ. of Guelph, Guelph, Ontario
L. W. Smith
Affiliation:
Dep. of Environmental Biology, Univ. of Guelph, Guelph, Ontario
C. M. Switzer
Affiliation:
Dep. of Environmental Biology, Univ. of Guelph, Guelph, Ontario
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Abstract

The foliar uptake of 4-amino-3,5,6-trichloropicolinic acid (picloram) and its phytotoxicity in mixtures with several phenoxy herbicides were studied using bean (Phaseolus vulgaris L. ‘Red Kidney’). The greatest accumulation of picloram occurred in the growing point, stem, and axillary buds. Transport from the treated leaf occurred within 6 hr and continued for at least 7 days. The effectiveness of herbicide combinations containing picloram was related to the particular plant part measured. A synergistic reduction in fresh and dry red kidney bean weight was obtained with (2,4-dichlorophenoxy) acetic acid (2,4-D) or 2-[(4-chloro-o-tolyl)oxy]propionic acid (mecoprop) when applied in combination with picloram, whereas 4-(2,4-dichlorophenoxy)butyric acid (2,4-DB) and picloram gave an antagonistic response. An investigation of the antagonistic reaction of 2,4-DB with picloram indicated that picloram prevented the movement of 2,4-DB, while 2,4-DB increased both the distribution and the amount of picloram translocated from the point of application.

Type
Research Article
Information
Weed Science , Volume 20 , Issue 3 , May 1972 , pp. 226 - 229
Copyright
Copyright © Weed Science Society of America 

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References

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