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Antagonistic Effects Between Picloram and Bromacil with Oats

Published online by Cambridge University Press:  12 June 2017

J. P. Sterrett ,
J. T. Davis  and
W. Hurtt
J. P. Sterrett
Affiliation:
Vegetation Control Division, Fort Detrick, Frederick, Maryland 21701
J. T. Davis
Affiliation:
Vegetation Control Division, Fort Detrick, Frederick, Maryland 21701
W. Hurtt
Affiliation:
Vegetation Control Division, Fort Detrick, Frederick, Maryland 21701
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Abstract

Combinations of 4-amino-3,5,6-trichloropicolinic acid (picloram) and 5-bromo-3-sec-butyl-6-methyluracil (bromacil) pellets applied to the soil gave antagonistic responses on oats (Avena sativa L. ‘Clintland 64′) with either 5.6 plus 11.2 kg/ha or 11.2 plus 11.2 kg/ha of picloram plus bromacil. In nutrient culture a significant antagonistic response occurred over a 15-day period with a picloram to bromacil ratio of 30 to 1. Of the ratios evaluated, picloram appeared to interfere with the phytotoxic effect of bromacil. The uptake of 14C-bromacil alone by oats from nutrient solution was nearly double that of 14C-bromacil when combined with picloram. Thin layer chromatographic analyses revealed that 47% of the 14C activity from bromacil in the oat was intact bromacil and that 70% of the labeled activity from picloram was unaltered picloram. The loss of nutrient solution by evapotranspiration was less from containers with picloram and bromacil than from those with bromacil alone. Picloramtreated roots were shorter than untreated or bromacil-treated roots.

Type
Research Article
Information
Weed Science , Volume 20 , Issue 5 , September 1972 , pp. 440 - 444
Copyright
Copyright © Weed Science Society of America 

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References

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