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Influence of Adjuvants and Application Variables on Postemergence Weed Control with Bentazon and Sethoxydim

Published online by Cambridge University Press:  12 June 2017

S. Kent Harrison ,
Loyd M. Wax  and
Loren E. Bode
S. Kent Harrison
Affiliation:
Dep. Agron., Univ. Illinois, Urbana, IL. 61801
Loyd M. Wax
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Univ. Illinois, Urbana, IL. 61801
Loren E. Bode
Affiliation:
Dep. Agric. Engineering, Univ. Illinois, Urbana, IL. 61801
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Abstract

Experiments were conducted at Urbana, IL, in 1983 and 1984 to determine the effect of adjuvants, adjuvant rate, and carrier volume on postemergence weed control with bentazon [3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide] and sethoxydim {2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one} in soybeans [Glycine max (L.) Merr. ‘Williams’]. Little difference was observed between a petroleum oil:emulsifier blend (83:17, v/v) (POC) and a soybean oil: emulsifier blend (85:15, v/v) (SBOC) in enhancing control of velvetleaf (Abutilon theophrasti Medik. # ABUTH) with 0.6 or 1.1 kg ai/ha bentazon. Application of bentazon in a carrier volume of 94 L/ha provided velvetleaf control equivalent to that applied in 187 L/ha. Increasing the adjuvant rate from 2.3 to 11.7 L/ha increased visible soybean injury but had no effect on velvetleaf control with bentazon. Control of giant foxtail (Setaria faberi Herrm. # SETFA) with 0.1 kg ai/ha sethoxydim was enhanced more by POC than by SBOC. Phytotoxicity of sethoxydim was not altered by changes in carrier volume or adjuvant rate under conditions of adequate soil moisture in 1983. Under limiting soil moisture in 1984, giant foxtail control with sethoxydim increased slightly when the adjuvant rate was increased from 4.6 to 11.7 L/ha, and carrier volume was increased from 47 to 187 L/ha.

Keywords

Carrier volumesoybean oilAbutilon theophrastiSetaria faberiABUTHSETFA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 34 , Issue 3 , May 1986 , pp. 462 - 466
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

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