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Effect of Prior Pesticide use on Thiocarbamate Herbicide Persistence and Giant Foxtail (Setaria faberi) Control

Published online by Cambridge University Press:  12 June 2017

Wade J. Rudyanski ,
Richard S. Fawcett  and
Ray S. McAllister
Wade J. Rudyanski
Affiliation:
Dep. Agron., Iowa State Univ., Ames, IA 50011
Richard S. Fawcett
Affiliation:
Dep. Agron., Iowa State Univ., Ames, IA 50011
Ray S. McAllister
Affiliation:
Dep. Agron., Iowa State Univ., Ames, IA 50011
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Abstract

Greenhouse and field experiments were conducted to investigate degradation rates and efficacy of EPTC (S-ethyl dipropyl carbamothioate), butylate [S-ethyl bis(2-methylpropyl)carbamothioate], vernolate (S-propyl dipropylcarbamothioate), and cycloate (S-ethyl cyclohexylethylcarbamothioate) in soils with and without prior history of thiocarbamate use. Herbicide persistence was measured by an oat (Avena sativa L.) bioassay, and giant foxtail (Setaria faberi Herrm. # SETFA) control was visually estimated in field studies. Both greenhouse and field studies indicated that enhanced thiocarbamate degradation occurred when the same herbicide (EPTC, butylate, or vernolate) was applied over successive years. Addition of dietholate (O,O-diethyl O-phenyl phosphorothioate) or fonofos (O-ethyl-S-phenylethylphosphonodithioate) increased thiocarbamate persistence and giant foxtail control in soils with prior thiocarbamate exposure. Use of dietholate or fonofos two or three consecutive years with EPTC or butylate again resulted in enhanced degradation. EPTC persistence and giant foxtail control were not affected by prior treatments or tank mixes with carbofuran (2,3-dihydro-2,2-dimethyl-7-benzofuranyl methylcarbamate). Rotation away from successive applications of the same thiocarbamate herbicide (EPTC, butylate, or vernolate) improved herbicide efficacy.

Keywords

EPTCbutylatecycloatevernolatedietholatefonofoscarbofuranenhanced degradationSetaria faberiSETFA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 35 , Issue 1 , January 1987 , pp. 68 - 74
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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