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Wild Proso Millet (Panicum miliaceum) Control with Thiocarbamate Herbicides on Previously Treated Soils

Published online by Cambridge University Press:  12 June 2017

R. Gordon Harvey ,
Gregory R. McNevin ,
John W. Albright  and
Mary Ellen Kozak
R. Gordon Harvey
Affiliation:
Dep. Agron., Univ. Wisconsin, Madison, WI 53706
Gregory R. McNevin
Affiliation:
Dep. Agron., Univ. Wisconsin, Madison, WI 53706
John W. Albright
Affiliation:
Dep. Agron., Univ. Wisconsin, Madison, WI 53706
Mary Ellen Kozak
Affiliation:
Dep. Agron., Univ. Wisconsin, Madison, WI 53706
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Abstract

Efficacy of EPTC (S-ethyl dipropylcarbamothioate), butylate [S-ethyl bis(2-methylpropyl)carbamothioate], vernolate (S-propyl dipropylcarbamothioate), and cycloate (S-ethyl cyclohexylethylcarbamothioate) applied with dichlormid (N,N-diallyl-2,2-dichloroacetamide), and the former three herbicides applied with dichlormid and dietholate (O,O-diethyl-O-phenol phosphorothioate) for wild proso millet (Panicum miliaceum L. ssp. ruderale (Kitagawa) Tzevelev. # PANMI) control in corn (Zea mays L.) was evaluated in fields previously treated with EPTC + dichlormid or EPTC + dichlormid + dietholate. Cycloate + dichlormid usually controlled millet regardless of prior herbicide use. But EPTC + dichlormid was less effective than on soils not previously treated with the herbicides, suggesting enhanced soil biodegradation. The use of EPTC + dichlormid with row cultivation or applications of selected herbicides improved millet control. Following prior use of EPTC + dichlormid, wild proso millet control was improved by the addition of dietholate to EPTC + dichlormid and vernolate + dichlormid but not butylate + dichlormid. In dissipation studies using soils previously treated with EPTC + dichlormid, the relative order of herbicide persistence was EPTC + dichlormid < vernolate + dichlormid < butylate + dichlormid < EPTC + dichlormid + dietholate < vernolate + dichlormid + dietholate = butylate + dichlormid + dietholate < cycloate + dichlormid. When EPTC + dichlormid + dietholate was applied to soils previously treated with that mixture, wild proso millet control was again reduced. Dissipation studies confirmed that dietholate slowed biodegradation of EPTC in soils previously treated with EPTC + dichlormid but not with EPTC + dichlormid + dietholate.

Keywords

ButylatecycloatedichlormiddietholatedissipationvernolateEPTCPANMI
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 34 , Issue 5 , September 1986 , pp. 773 - 780
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

Literatur Cited

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