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Effect of Herbicide and Weed Height on Johnsongrass (Sorghum halepense) Control and Cotton (Gossypium hirsutum) Yield

Published online by Cambridge University Press:  12 June 2017

David C. Bridges  and
J. M. Chandler
David C. Bridges
Affiliation:
Dep. Soil Crop Sci., Tex. Agric. Exp. Stn., College Station, TX 77843-2474. TAES No. 21970
J. M. Chandler
Affiliation:
Dep. Soil Crop Sci., Tex. Agric. Exp. Stn., College Station, TX 77843-2474. TAES No. 21970
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Abstract

Research was conducted from 1983 through 1985 in east central Texas to determine the effect of grass-specific herbicides, herbicide rates, and weed height on johnsongrass [Sorghum halepense (L.) Pers. #3 SORHA] control and cotton (Gossypium hirsutum L. 'Stoneville 825’) yield. Seven herbicides were applied to johnsongrass less than 30 cm tall with 2 to 5 leaves approximately 4 weeks after cotton emergence. Good-to-excellent johnsongrass control was observed for each herbicide except cloproxydim {(E,E)-2-[l-[[(3-chloro-2-propenyl)oxy]imino] butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one} at 0.56 kg ai/ha and sethoxydim {2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one} at 0.28 kg ai/ha. Few significant differences were found in seed cotton yields even though johnsongrass control ranged from 43 to 99% 26 days after treatment (DAT). These data suggest that johnsongrass regrowth and/or reinfestation following initial control of 75% or higher during the first 4 to 6 weeks after cotton emergence has a minimum negative effect on cotton yield. Johnsongrass control was highest when either fluazifop-P {(R)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acid} or haloxyfop {2-[4-[[3-chloro-5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy] propanoic acid} was applied to 15 to 30 cm tall johnsongrass.

Keywords

Efficacytimingweed heightcloproxydimfluazifopfluazifop-PhaloxyfopquizalofopSC-1084sethoxydimSORHA.
Type
Research
Information
Weed Technology , Volume 1 , Issue 3 , July 1987 , pp. 207 - 211
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

Literature Cited

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