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Addition of R-33865 to EPTC for Extended Herbicide Activity

Published online by Cambridge University Press:  12 June 2017

Tim Obrigawitch ,
Fred W. Roeth ,
Alex R. Martin  and
Robert G. Wilson Jr.
Tim Obrigawitch
Affiliation:
Dep. Agron., Univ. of Nebraska, Lincoln, NE 68583
Fred W. Roeth
Affiliation:
South Central Stn., Univ. of Nebraska, Clay Center, NE 68933
Alex R. Martin
Affiliation:
Dep. Agron., Univ. of Nebraska, Lincoln, NE 68583
Robert G. Wilson Jr.
Affiliation:
Panhandle Stn., Univ. of Nebraska, Scottsbluff, NE 69361
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Abstract

Laboratory and field studies were conducted to examine the influence of R-33865 (O, O-diethyl-O-phenol phosphorothioate) on the degradation rate of EPTC (S-ethyl dipropylthiocarbamate) in three soils that had a history of repeated EPTC application and exhibited accelerated degradation of EPTC. In field studies, addition of R-33865 to EPTC extended EPTC persistence in soil and provided increased shattercane [Sorghum bicolor (L.) Moench] control. In two soils that exhibited rapid EPTC degradation, addition of R-33865 to EPTC extended the half-life of EPTC from 9 to 18 days and from 6 to 15 days, respectively. Evolution of 14CO2 from 14C-carbonyl EPTC-treated soils with a prior history of EPTC treatment was significantly reduced when R-33865 was added; however, the initial lag period of EPTC degradation was not restored. Addition of R-33865 to EPTC on soils with no prior EPTC treatment did not extend persistence of EPTC in soil.

Keywords

Sorghum bicolorextendermicrobial inhibitorsoil persistencebutylate
Type
Research Article
Information
Weed Science , Volume 30 , Issue 4 , July 1982 , pp. 417 - 422
Copyright
Copyright © 1982 by the Weed Science Society of America 

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References

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