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Influence of Fonofos on the Distribution and Metabolism of 14C-Terbacil in Peppermint

Published online by Cambridge University Press:  12 June 2017

Andre J. Weierich ,
Zeldon A. Nelson  and
Arnold P. Appleby
Andre J. Weierich
Affiliation:
Dep. of Agron. Crop Sci., Oregon State Univ., Corvallis, OR 97331
Zeldon A. Nelson
Affiliation:
Dep. of Agron. Crop Sci., Oregon State Univ., Corvallis, OR 97331
Arnold P. Appleby
Affiliation:
Dep. of Agron. Crop Sci., Oregon State Univ., Corvallis, OR 97331
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Abstract

When the insecticide fonofos (O-ethyl-S-phenylethylphosphonodithioate) was added to a nutrient solution containing 14C-terbacil (3-tert-butyl-5-chloro-6-methyluracil), movement of total radioactivity into leaves of peppermint (Mentha piperita L. cv. ‘Todd's Mitchum’) during a 3-day treatment period approximately doubled. In addition, a higher percentage of this total radioactivity was identified as intact terbacil. Total radioactivity in the leaves was not significantly increased when terbacil was added to 14C-fonofos in nutrient solution. Studies also were conducted to measure the effect of fonofos upon the rate of terbacil metabolism in peppermint. Peppermint plants were treated for 3 days with nutrient solution containing 14C-terbacil alone or 14C-terbacil plus fonofos. The percentage of total radioactivity which remained as intact terbacil at the end of the treatment period was five times as high in plants treated with the combination as in those treated with terbacil alone. The relative rate of degradation during the succeeding 11 days was approximately the same in plants subjected to the two treatments. These results could account for damage to peppermint from closely timed applications of fonofos and terbacil in the field.

Type
Research Article
Information
Weed Science , Volume 25 , Issue 1 , January 1977 , pp. 27 - 29
Copyright
Copyright © 1977 by the Weed Science Society of America 

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