Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-26T10:17:44.078Z Has data issue: false hasContentIssue false
  • English
  • Français

Effects of Herbicide Application Timing on Johnsongrass (Sorghum halepense) and Pitted Morningglory (Ipomoea lacunosa) Control

Published online by Cambridge University Press:  12 June 2017

David R. Shaw ,
Sunil Ratnayake  and
Clyde A. Smith
David R. Shaw
Affiliation:
Dep. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
Sunil Ratnayake
Affiliation:
Dep. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
Clyde A. Smith
Affiliation:
Dep. Plant Pathol. Weed Sci., Miss. State Univ., Mississippi State, MS 39762
Get access Rights & Permissions [Opens in a new window]

Abstract

Field experiments were conducted to evaluate the influence of application timing of imazethapyr and fluazifop-P on rhizome johnsongrass and pitted morningglory control in soybean. Herbicides were applied at three timings keyed to johnsongrass heights of 15, 30, and 60 cm and 3-, 6-, and 9-leaf pitted morningglory. Evaluations 6 wk after the final treatment indicated imazethapyr controlled both species best when applied at the 15-cm johnsongrass growth stage. Increasing imazethapyr rate did not increase control of pitted morningglory, but did increase johnsongrass control at the 15-cm application timing. However, at the 30-cm johnsongrass application timing, increasing the rate from 0.07 to 0.10 kg ha-1 improved control of both species. Johnsongrass control with imazethapyr was no more than 64% when applications were delayed to 30-cm or larger johnsongrass. Fluazifop-P controlled johnsongrass well at all timings.

Keywords

Fluazifop-P, (R)-2-[4-[[5-trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidimazethapyr, (±)-2-[4,5-dihdyro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidjohnsongrass, Sorghum halepense (L.) Pers. ♯3 SORHApitted morningglory, Ipomoea lacunosa L. ♯ IPOLAsoybean, Glycine max (L.) Merr.Fluazifop-Pgrowth stageimazethapyrpostemergenceGlycine max
Type
Research
Information
Weed Technology , Volume 4 , Issue 4 , December 1990 , pp. 900 - 903
Copyright
Copyright © 1990 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. Baldwin, F. L., and Frans, R. E. 1972. Soybean and weed response to dinoseb and chloroxuron applied topically. Weed Sci. 20:511–514.Google Scholar
2. Banks, P. A., and Tripp, T. N. 1983. Control of johnsongrass (Sorghum halepense) in soybeans (Glycine max) with foliar applied herbicides. Weed Sci. 31:626–633.Google Scholar
3. Barker, M. A., Thompson, L. Jr., and Godley, F. M. 1984. Control of annual morningglories (Ipomoea spp.) in soybeans (Glycine max). Weed Sci. 32:813–818.Google Scholar
4. Bryson, C. T. 1987. Effects of rainfall on foliar herbicides applied to rhizome johnsongrass. Weed Sci. 35:115–119.Google Scholar
5. Dale, J. E. 1981. Control of johnsongrass (Sorghum halepense) and volunteer corn (Zea mays) in soybeans. Weed Sci. 29:708–711.Google Scholar
6. Driver, J., and Frans, R. 1982. Selective postemergence control of johnsongrass in soybeans and cotton. Proc. South. Weed Sci. Soc. 35:27.Google Scholar
7. Elmore, C. D. 1986. Weed survey–Southern States. Res. Rep. South. Weed Sci. Soc. 39:136.Google Scholar
8. Horowitz, M. 1972. Early development of johnsongrass. Weed Sci. 20:271–273.Google Scholar
9. Howe, O. W. III and Oliver, L. R. 1987. Influence of soybean (Glycine max) row spacing on pitted morningglory (Ipomoea lacunosa) interference. Weed Sci. 35:185–193.Google Scholar
10. King, C. A., and Oliver, L. R. 1989. Timing of postemergence imazethapyr (Pursuit) applications. Proc. South. Weed Sci. Soc. 42:58.Google Scholar
11. McClelland, M. R., Oliver, L. R., Mathis, W. D., and Frans, R. E. 1978. Responses of six morningglory (Ipomoea) species to bentazon. Weed Sci. 26:459–466.Google Scholar
12. Micheal, S. D., Williams, W. W., and Martin, J. R. 1987. Johnsongrass (Sorghum halepense) control and soil moisture relationships in no-tillage doublecropped soybeans (Glycine max). Weed Sci. 35:108–114.Google Scholar
13. McWhorter, C. G., and Anderson, J. M. 1981. The technical and economic effects of johnsongrass (Sorghum halepense) control in soybeans (Glycine max). Weed Sci. 29:245–253.CrossRefGoogle Scholar
14. Muzyk, K. R., Dobson, J. B., O'Neil, J. B., Walls, F. R., Youmans, C. D., and Van Winkle, D. 1987. Pursuit: soybean efficacy traits in the Atlantic Coast Region. Proc. South. Weed Sci. Soc. 40:45.Google Scholar
15. Rogers, R. L., and Crawford, S. H. 1980. Weed control in soybeans with acifluorfen (Blazer). Proc. South. Weed Sci. Soc. 33:50.Google Scholar
16. Williams, C. S., and Hayes, R. M. 1984. Johnsongrass (Sorghum halepense) competition in soybeans (Glycine max). Weed Sci. 32:498–501.Google Scholar
17. Vidrine, P. R., Reynolds, D. B., and Griffin, J. L. 1988. Performance of imazethapyr in soybeans. Proc. South. Weed Sci. Soc. 40:40.Google Scholar