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Persistence of Phytotoxicity of Metribuzin and Its Ethylthio Analog

Published online by Cambridge University Press:  12 June 2017

David R. Shaw ,
Thomas F. Peeper  and
Robert L. Westerman
David R. Shaw
Affiliation:
Dep. Agron., Okla. State Univ., Stillwater, OK 74078
Thomas F. Peeper
Affiliation:
Dep. Agron., Okla. State Univ., Stillwater, OK 74078
Robert L. Westerman
Affiliation:
Dep. Agron., Okla. State Univ., Stillwater, OK 74078
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Abstract

The persistence of biologically active metribuzin [4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one] and its ethylthio analog [4-amino-6-(1,1-dimethylethyl)-3-(ethylthio)-1,2,4-triazin-5(4H)-one] were compared using an intact-plant chlorophyll fluorescence bioassay technique with oats (Avena sativa L.) and wheat (Triticum aestivum L.). Degradation of metribuzin phytotoxicity at concentrations of 0 to 1 ppm (w/w) ai in a Pond Creek silt loam soil was linear over time, with a half-life of 8 days at 35 C. Initial degradation of the biologically active ethylthio analog was much more rapid than for metribuzin, with a decrease in rate at later time intervals. A quadratic function best described this degradation pattern. The initial degradation rate of phytotoxicity for the ethylthio analog indicated a half-life of 4 days at 35 C. Soil pH had no significant influence on the activity or persistence of either herbicide within the range 4.9 to 6.9.

Keywords

Degradationbiological activitychlorophyll fluorescence bioassay
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 34 , Issue 3 , May 1986 , pp. 409 - 412
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

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