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Effect of DMSO and Surfactant Combinations on Tissue Concentrations of Picloram

Published online by Cambridge University Press:  12 June 2017

J. R. Baur ,
R. W. Bovey  and
J. D. Smith
J. R. Baur
Affiliation:
Plant Sci. Res. Div., Agr. Res. Serv., U.S. Dep. of Agr., Dep. of Range Sci., Texas A&M Univ., College Station, Texas 77843
R. W. Bovey
Affiliation:
Plant Sci. Res. Div., Agr. Res. Serv., U.S. Dep. of Agr., Dep. of Range Sci., Texas A&M Univ., College Station, Texas 77843
J. D. Smith
Affiliation:
Dep. of Plant Sci., Texas A&M Univ., College Station, Texas 77843
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Abstract

Over a 2-year period no treatment differences were noted in 4-amino-3,5,6-trichloropicolinic acid (picloram) concentrations recovered from grass and yaupon (Ilex vomitoria Ait.) tissues treated with 1.12 kg/ha of picloram in mixture with dimethyl sulfoxide (DMSO) and surfactant (X-77).4 Less than 1 μg of picloram per gram of fresh weight of grass or yaupon was present in aerial tissue 6 months after treatment, in yaupon stem tissues 1 month after treatment, and in yaupon root tissue 5 days after treatment. Tissues sampled 1 year after treatment were devoid of picloram residue; tissues sampled 1 year after retreatment had levels ranging from 0.04 to 0.26 μg/g. The April application of 1.12 kg/ha of picloram plus 5.0% X-77 plus 10.0 or 25.0% of DMSO produced more effective canopy reduction of yaupon 1 year after treatment than did other herbicide treatments or dates of treatment. Increased canopy reduction by retreatment the second year suggests that X-77 rather than DMSO was the effective component in the spray mixtures.

Type
Research Article
Information
Weed Science , Volume 20 , Issue 4 , July 1972 , pp. 298 - 302
Copyright
Copyright © Weed Science Society of America 

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References

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