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Johnsongrass (Sorghum halepense) Control in Soybeans (Glycine max) with Metriflufen Applied Postemergence

Published online by Cambridge University Press:  12 June 2017

W. R. Azlin  and
C. G. McWhorter
W. R. Azlin
Affiliation:
South. Weed Sci. Lab., Sci. Ed. Admin., Agric. Res., U.S. Dep. Agric., Stoneville, MS 38776
C. G. McWhorter
Affiliation:
South. Weed Sci. Lab., Sci. Ed. Admin., Agric. Res., U.S. Dep. Agric., Stoneville, MS 38776
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Abstract

Over-the-top applications of metriflufen {2-[4-(4-trifluoromethylphenoxy)phenoxy] propanoic acid} at 0.6 to 2.2 kg/ha were highly toxic to johnsongrass [Sorghum halepense (L.) Pers.], but caused little visual injury to soybeans [Glycine max (L.) Merr. ‘Hill’]. Directed applications of metriflufen at 0.8 to 3.4 kg/ha provided equal and, in a few comparisons, better control of johnsongrass than did some rates of the herbicide applied over-the-top. Application of metriflufen at 0.8 and 1.7 kg/ha in directed sprays resulted in higher soybean yields than did comparable treatments applied over-the-top; yields of directed vs. over-the-top applications of metriflufen at 3.4 kg/ha resulted in statistically equal soybean yields. The research suggested that metriflufen entered johnsongrass plants through shoots and leaves and also through roots. Johnsongrass control was excellent following applications of metriflufen at 1.7 and 2.2 kg/ha without soybean injury and with greatly increased soybean yields. Results following over-the-top applications of metriflufen at 1.1 kg/ha to ‘Hill’, ‘Tracy’, ‘Lee 68’, ‘Bragg’, and ‘Forrest’ soybeans at three different stages of morphological development did not demonstrate any appreciable differences in the response of the cultivars to the herbicide.

Keywords

Weed controlherbicide controlweed competition
Type
Research Article
Information
Weed Science , Volume 29 , Issue 1 , January 1981 , pp. 139 - 143
Copyright
Copyright © 1981 by the Weed Science Society of America 

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References

Literature Cited

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