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Progressive Kill of Rhizomatous Johnsongrass (Sorghum Halepense) from Repeated Treatment with Dalapon, MSMA, or Asulam

Published online by Cambridge University Press:  12 June 2017

Rex W. Millhollon
Rex W. Millhollon*
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., U.S. Sugarcane Field Lab., Houma, LA 70361
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Abstract

Space-planted johnsongrass [Sorghum halepense (L.) Pers. ♯ SORHA] was clipped back to a height of 26 cm after flowering and, when 45 to 61 cm in height, was treated with various rates of the sodium salt of dalapon (2,2-dichloropropionic acid), MSMA (monosodium methanearsonate), or the sodium salt of asulam (methylsulfanilylcarbamate). Treatments were reapplied as needed during the growing season whenever a majority of surviving plants in a plot had initiated new foliar growth. Most plants were not killed by a single application of any herbicide, although rhizome development, as measured by the number of rhizome buds, was inhibited by the initial herbicide treatments. MSMA at 4.5 kg ai/ha was more phytotoxic to johnsongrass than other herbicide treatments or MSMA at 2.3 kg ai/ha; a single application at the higher rate reduced the original number of rhizome buds on plants by 50 to 60%, and two applications killed 86 to 93% of the plants. Asulam at 4.5 and 6.7 kg ae/ha and dalapon at 6.7 and 9.0 kg ae/ha primarily controlled plants by inhibiting growth for an extended period. After two or three applications of asulam or dalapon at 6.7 kg ae/ha, only about 40% of the plants had been killed, but the original number of rhizome buds on surviving plants had been reduced by about 80%.

Keywords

Foliar treatmentssystemic herbicidesherbicide translocationsugarcane herbicidesSORHA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 33 , Issue 2 , March 1985 , pp. 216 - 221
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

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