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Spot Spraying for Johnsongrass (Sorghum halepense) Control in Soybeans (Glycine max)

Published online by Cambridge University Press:  12 June 2017

C. G. Mcwhorter  and
W. L. Barrentine
C. G. Mcwhorter
Affiliation:
U.S. Dep. Agric. and Delta Branch, Mississippi Agric. and For. Exp. Stn., Stoneville, MS 38776
W. L. Barrentine
Affiliation:
U.S. Dep. Agric. and Delta Branch, Mississippi Agric. and For. Exp. Stn., Stoneville, MS 38776
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Abstract

Dalapon (2,2-dichloropropionic acid), TCA ester [ethyleneglycol bis(trichloroacetate)], MSMA (monosodium methanearsonate), and glyphosate [N-(phosphonomethyl)glycine] were evaluated for their effectiveness as spot spray treatments to johnsongrass [Sorghum halepense (L.) Pers.] 30, 75, or 100 cm tall from rhizomes. Glyphosate was also applied as a spot spray to soybeans [Glycine max (L.) Merr. ‘Pickett 71′] to determine its effect on stand losses and subsequent soybean yields. Glyphosate at a concentration of 6 or 12 g/L of water was the most effective treatment regardless of johnsongrass height. A single application provided excellent-to-complete seasonal control within 2 weeks after application. Repeated applications of dalapon, MSMA, and TCA ester would be needed for season-long control. Glyphosate at a concentration of 6 g/L of water applied to 0.5 m long spots of soybeans in late August reduced soybean yields 9, 17, and 28% while the stand was reduced 5,10, and 20%, respectively.

Keywords

DalaponTCA esterglyphosateMSMA
Type
Research Article
Information
Weed Science , Volume 27 , Issue 1 , January 1979 , pp. 119 - 121
Copyright
Copyright © 1979 by the Weed Science Society of America 

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References

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