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Effects of Rainfall on Foliar Herbicides Applied to Rhizome Johnsongrass

Published online by Cambridge University Press:  12 June 2017

Charles T. Bryson
Charles T. Bryson*
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., South. Weed Sci. Lab., Stoneville, MS 38776
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Abstract

A rainfall simulator was used to evaluate the effects of washoff on 10 foliar-applied herbicides on johnsongrass [Sorghum halepense (L.) Pers. # SORHA] in greenhouse experiments during 1983 and 1984 at Stoneville, MS. Time intervals between herbicide application and rainfall ranged from 20 to 240 min. Johnsongrass topgrowth control was equivalent to rain-free treatments using DPX-Y6202 {ethyl [2-[4-(6-chloro-2-quinozalinyl)oxy] phenoxy] propionate} at 0.03 and 0.06 kg/ha at time periods of 90 and 40 min between herbicide application and rainfall, respectively, at 28 days after treatment (DAT). A period of 120 min was required for johnsongrass control equivalent to rain-free treatments using sethoxydim {2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one} at 0.06 kg/ha, haloxyfop {2-[4-[[3-chloro-5-(trifluoromethyl)-2-pyridinyl]oxy] phenoxy] propanoic acid} at 0.03 and 0.06 kg/ha, and cloproxydim {(E,E-2-[1-[[(3-chloro-2-propenyl)oxy] imino] butyl]-5-[2-ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one} at 28 DAT. Neither glyphosate [N-(phosphonomethyl)glycine] and SC-0224 (trimethylsulfoniumcarboxy methylaminomethylphosphonate) at 0.45 and 0.99 kg/ha nor other selective herbicides at 0.03 and 0.06 kg/ha gave equivalent johnsongrass topgrowth control to rain-free treatments when rainfall occurred within 240 and 120 min, respectively.

Keywords

CloproxydimCGA-82725DPX-Y6202fenoxapropfluazifopglyphosatehaloxyfopsethoxydimSC-0224SC-1084washoffefficacySorghum halepenseSORHA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 35 , Issue 1 , January 1987 , pp. 115 - 119
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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