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Influence of Prior Pesticide Treatments on EPTC and Butylate Degradation

Published online by Cambridge University Press:  12 June 2017

Brent W. Bean ,
Fred W. Roeth ,
Alex R. Martin  and
Robert G. Wilson
Brent W. Bean
Affiliation:
Dep. Agron., Univ. Nebraska, Lincoln, 68583
Fred W. Roeth
Affiliation:
South Central Res. and Ext. Ctr., Clay Center, 68933
Alex R. Martin
Affiliation:
Dep. Agron., Lincoln, 68583
Robert G. Wilson
Affiliation:
Panhandle Res. and Ext. Ctr., Scottsbluff, 69361
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Abstract

Field and laboratory studies were conducted to examine the influence of previous pesticide use, number of prior EPTC (S-ethyl dipropyl carbamothioate) and butylate [S-ethyl bis(2-methylpropyl)carbamothioate] applications, and pretreatment of soil with EPTC and butylate metabolites on EPTC and butylate degradation. EPTC degradation was enhanced in Clay Center and Scottsbluff soils following three annual EPTC, butylate, or vernolate (S-propyl dipropylcarbamothioate) applications, but was not affected in soils following three annual atrazine [6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diamine], cyanazine {2-[[4-chloro-6-(ethylamino)-1,3,5-triazin-2-yl] amino]-2-methylpropanenitrile}, metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide], alachlor [2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide], or cycloate (S-ethyl cyclohexylethylcarbamothioate) applications. EPTC degradation rate was not affected in a Scottsbluff soil following three annual carbofuran (2,3-dihydro-2,2-dimethyl-7-benzofuranyl methylcarbamate) applications, but was partially enhanced in a Clay Center soil. Self- and cross-enhanced degradation of EPTC and butylate did not change regardless of the number of prior annual applications of each herbicide. The degradation rates of EPTC and butylate were not affected by soil pretreated with butylate sulfone, but the degradation rates-were fully enhanced by pretreatment with the respective sulfoxides of each herbicide. In cross-enhancement testing, EPTC and butylate degradation was partially enhanced in Clay Center soil pretreated with the sulfoxides of each.

Keywords

Accelerated degradationenhancementpersistencecarbamothioate
Type
Soil, Air, and Water
Information
Weed Science , Volume 36 , Issue 1 , January 1988 , pp. 70 - 77
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

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