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Mechanism of Synergism Between Metribuzin and MZH 2091 on Ivyleaf Morningglory (Ipomoea hederacea)

Published online by Cambridge University Press:  12 June 2017

Eva E. Klamroth ,
Carl Fedtke  and
Walter C. Kühbauch
Eva E. Klamroth
Affiliation:
Allgemeiner Pflanzenbau, Universität Bonn, Katzenburgweg 5, 5300 Bonn 1, Fed. Rep. of Germany Bayer AG, Geschäftsbereich Pflanzenschutz, Anwendungstechnik/Beratung, Pflanzenschutzzentrum Monheim, 5090 Leverkusen, Fed. Rep. of Germany
Carl Fedtke
Affiliation:
Bayer AG, Geschäftsbereich Pflanzenschutz, Anwendungstechnik/Biologische Forschung, Pflanzenschutzzentrum Monheim, 5090 Leverkusen, Fed. Rep. of Germany
Walter C. Kühbauch
Affiliation:
Allgemeiner Pflanzenbau, Universität Bonn, Katzenburgweg 5,5300 Bonn 1, Fed. Rep. of Germany
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Abstract

Experiments were conducted in order to establish the mechanism by which the synergist MZH 2091 increases metribuzin activity on ivyleaf morningglory. Herbicide absorption and metabolism were compared for plants treated either with 14C-metribuzin alone or with 14C-metribuzin plus nonlabeled MZH 2091. The compounds were applied via the roots for 3 h and the absorption was determined. After the pulse treatment, the plants were grown for additional 0, 3, 6, 9, 12, 21, 45, or 69 h in water, and the metribuzin metabolism was studied in the cotyledons. The synergist did not interfere with herbicide uptake but did strongly inhibit metribuzin metabolism. The pathway of metribuzin metabolism in ivyleaf morningglory is discussed as well as the way it is affected by the synergist MZH 2091.

Keywords

MZH 2091, N-(1,1-dimethylethyl)-pyridine-2-car-boxamidemetribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5 (4H)-oneivyleaf morningglory, Ipomoea hederacea L. Jacq. ♯3 IPOHEMetribuzinsynergistsynergismabsorptionmetabolismdeaminationconjugationweed toleranceIPOHE
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 37 , Issue 4 , July 1989 , pp. 517 - 520
Copyright
Copyright © 1989 by the Weed Science Society of America 

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