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Movement and Activity of Glyphosate in Purple Nutsedge

Published online by Cambridge University Press:  12 June 2017

Bernard H. Zandstra  and
Roy K. Nishimoto
Bernard H. Zandstra
Affiliation:
Dep. Hort., Univ. Hawaii, 3190 Maile Way, Honolulu, HI 96822
Roy K. Nishimoto
Affiliation:
Dep. Hort., Univ. Hawaii, 3190 Maile Way, Honolulu, HI 96822
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Abstract

Tubers from purple nutsedge (Cyperus rotundus L.) plants grown in the greenhouse for 2 to 10 weeks did not germinate after foliar applications of 4 kg/ha glyphosate (N-(phosphonomethyl)glycine). Some tubers from 12- and 24-week-old purple nutsedge plants survived glyphosate application. Translocation of 14C-glyphosate from treated purple nutsedge leaves to other plant parts increased from 5% of the amount applied at 1 day to 19% at 4 days after application. Specific activity of 14C in tubers was greater than in leaves of plants 2- to 6-week-old. With increasing plant age, specific activity decreased in both tubers and leaves. As purple nutsedge grew older, total 14C translocated increased in tubers, and decreased slightly in leaves. Thin layer chromatography showed no evidence of glyphosate metabolism in purple nutsedge.

Type
Research Article
Information
Weed Science , Volume 25 , Issue 3 , May 1977 , pp. 268 - 274
Copyright
Copyright © 1977 by the Weed Science Society of America 

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References

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