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Populations of EPTC-Degrading Microorganisms in Soils by Accelerated Rates of EPTC Degradation

Published online by Cambridge University Press:  12 June 2017

Thomas B. Moorman
Thomas B. Moorman*
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Southern Weed Sci. Lab., Stoneville, MS 38776
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Abstract

Reduced effectiveness of carbamothioate (thiocarbamate) herbicides in certain soils has been attributed to rapid herbicide degradation by soil microorganisms. Studies were conducted to determine if greater populations of EPTC (S-ethyl dipropyl carbamothioate)-degrading microorganisms were responsible for increased rates of degradation observed following repeated applications of EPTC to a Grenada silt loam soil. EPTC-degrading microorganism populations, measured with a 14C-MPN (most-probable-number) technique, were not larger in soils with accelerated rates of EPTC degradation, and degrader populations did not increase after application of 6 mg EPTC/kg of soil. Degrader populations increased after application of 60 mg EPTC/kg of soil only in soil previously treated for 6 yr with EPTC. Increased rates of metabolism of EPTC were apparently responsible for the increased rates of degradation, rather than increased populations of degraders.

Keywords

Accelerated degradationadaptionherbicidessoil persistencecarbamothioates
Type
Soil, Air, and Water
Information
Weed Science , Volume 36 , Issue 1 , January 1988 , pp. 96 - 101
Copyright
Copyright © 1988 by the Weed Science Society of America 

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