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Phytotoxicity of Trifluralin Vapors from Soil

Published online by Cambridge University Press:  12 June 2017

Charles W. Swann  and
Richard Behrens
Charles W. Swann
Affiliation:
Dep. of Agron. and Plant Genet., Univ. of Minnesota
Richard Behrens
Affiliation:
Dep. of Agron. and Plant Genet., Univ. of Minnesota, St. Paul, Minnesota 55108
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Abstract

Foxtail millet [Setaria italica (L.) Beauv. ‘Empire’] and proso millet (Panicum miliaceum L. ‘White’) seedlings were grown in glass units to expose selectively either roots or shoots to vapors arising from soil containing a,a,a-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine (trifluralin). The root and shoot growth of both species was inhibited by trifluralin vapors. Suppression of root and shoot growth increased as trifluralin application rates increased. In shoot exposure, vapors arising from soil treated with 5 ppmw of trifluralin were lethal to seedlings of both species. In root exposure, root growth of both species was severely suppressed at 20 ppmw, but shoot growth was unaffected. Phytotoxic effects resulting from a given concentration of trifluralin were more severe as greater carrier volumes were used for application. Trifluralin vapors arising from soil 16 to 22 days after treatment were still sufficient to cause shoot growth inhibition.

Type
Research Article
Information
Weed Science , Volume 20 , Issue 2 , March 1972 , pp. 143 - 146
Copyright
Copyright © Weed Science Society of America 

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References

Literature Cited

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