Hostname: page-component-7479d7b7d-8zxtt Total loading time: 0 Render date: 2024-07-10T22:31:26.875Z Has data issue: false hasContentIssue false

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
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

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.

Type
Weed Control and Herbicide Technology
Copyright
Copyright © 1986 by the Weed Science Society of America 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Literature Cited

1. Barrentine, W. L. and McWhorter, C. G. 1985. Oil carriers for herbicides applied postemergence to johnsongrass. Abstr. Weed Sci. Soc. Am. Page 4.Google Scholar
2. Buhler, D. D. and Burnside, O. C. 1984. Effect of application factors on postemergence phytotoxicity of fluazifop-butyl, haloxyfop-methyl, and sethoxydim. Weed Sci. 32:574583.CrossRefGoogle Scholar
3. Chernicky, J. P., Gossett, B. J., and Murphy, T. R. 1984. Factors influencing control of annual grasses with sethoxydim or RO-13-8895. Weed Sci. 32:174177.Google Scholar
4. Coffman, C. B. and Gentner, W. A. 1984. Soybean oil concentrate application on selected plant species. Abstr. Weed Sci. Soc. Am. Page 12.Google Scholar
5. Doran, D. L. and Andersen, R. N. 1975. Effect of simulated rainfall on bentazon activity. Weed Sci. 23:105109.CrossRefGoogle Scholar
6. Fehr, W. R., Caviness, C. E., Burwood, D. T., and Pennington, J. S. 1971. Stage of development descriptions for soybeans. Crop Sci. 11:929931.Google Scholar
7. Hartzler, R. G. and Foy, C. L. 1983. Efficacy of three postemergence grass herbicides for soybeans. Weed Sci. 31:557561.Google Scholar
8. Inman, S. A. and Kapustra, G. 1983. Evaluation of CDA rotary nozzles for weed control in soybeans. Abstr. Weed Sci. Soc. Am. Page 54.Google Scholar
9. Nalewaja, J. D. and Adamczewski, K. A. 1977. Redroot pigweed (Amaranthus retroflexus) control with bentazon plus additives. Weed Sci. 25:506510.CrossRefGoogle Scholar
10. Nalewaja, J. D., Pudelko, J., and Adamczewski, K. A. 1975. Influence of climate and additives on bentazon. Weed Sci. 23: 504507.Google Scholar
11. Oliver, L. R., Banks, V. E., and Walker, J. T. 1984. Soybean oil as a carrier or adjuvant for postemergence herbicides. Abstr. Weed Sci. Soc. Am. Page 12.Google Scholar