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Timing Effects on Johnsongrass (Sorghum halepense) Control with Asulam in Sugarcane (Saccharum sp.)

Published online by Cambridge University Press:  12 June 2017

Edward P. Richard Jr.
Edward P. Richard Jr.*
Affiliation:
Sugarcane Res. Unit, Agric. Res. Serv., U.S. Dep. Agric., P.O. Box 470, Houma, LA 70361
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Abstract

Full-season johnsongrass competition reduced sugar yields by 53 and 44% in ‘CP 70–321’ and ‘CP 72–370’ sugarcane, respectively, primarily by reducing sugarcane stalk populations. Stalk population and height and sugar yields of both cultivars were optimized when asulam was applied at 3.7 kg ai/ha during April and early May. Asulam at 3.4 kg/ha, applied a second time 8 weeks later, generally increased johnsongrass control but did not increase sugar yields over one early application. By delaying the application, the potential for sugarcane injury from asulam applied once or twice increased in both cultivars. Injury appeared to be related to the stage of sugarcane growth and temperature and moisture stress at application time with asulam phytotoxicity being more pronounced in CP 72–370. Populations of johnsongrass stems in the year after treatment reflected the degree of johnsongrass control by asulam and the competitiveness of the crop in the previous year.

Keywords

Asulam, methyl [(4-aminophenyl) sulfonyl]carbamatejohnsongrass, Sorghum halepense (L.)Pers. ♯3 SORHAsugarcane, Saccharum interspecific hybrids ‘CP 70–321’ and ‘CP 72–370’Johnsongrass competitioncultivar toleranceapplication timingSORHA
Type
Research
Information
Weed Technology , Volume 4 , Issue 1 , March 1990 , pp. 81 - 86
Copyright
Copyright © 1990 Weed Science Society of America 

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References

Literature Cited

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