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Postemergence Grass Control with Herbicides Applied at ULV in Paraffinic Oil

Published online by Cambridge University Press:  12 June 2017

Chester G. McWhorter ,
William L. Barrentine  and
James E. Hanks
Chester G. McWhorter
Affiliation:
U.S. Dep. Agric., Plant Physiol., Delta Res. and Ext. Cent., Miss. Agric. and For. Exp. Stn., and Agric. Eng., Applic. Tech. Res. Unit., Agric. Res. Serv., U.S. Dep. Agric., Stoneville, MS 38776
William L. Barrentine
Affiliation:
U.S. Dep. Agric., Plant Physiol., Delta Res. and Ext. Cent., Miss. Agric. and For. Exp. Stn., and Agric. Eng., Applic. Tech. Res. Unit., Agric. Res. Serv., U.S. Dep. Agric., Stoneville, MS 38776
James E. Hanks
Affiliation:
U.S. Dep. Agric., Plant Physiol., Delta Res. and Ext. Cent., Miss. Agric. and For. Exp. Stn., and Agric. Eng., Applic. Tech. Res. Unit., Agric. Res. Serv., U.S. Dep. Agric., Stoneville, MS 38776
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Abstract

Variables affecting ultra-low-volume (ULV) application of herbicides for postemergence grass control in soybeans were evaluated in field experiments from 1988 to 1990. Air-assist applications of clethodim at 2.3 and 4.7 L ha–1 were compared with 94 and 187 L ha–1 applications with a conventional hydraulic sprayer. Rate of herbicide, volume of diluent, type of diluent, air pressure, and four other herbicides were evaluated. Clethodim at 28, 56, and 112 g ha–1 applied in paraffinic oil at 2.3 L ha–1 controlled johnsongrass better 10 wk after treatment than equivalent rates applied at 2.3 or 187 L ha–1 in water. At 2.3 L ha–1, barnyardgrass control was improved by applying clethodim in paraffinic oil rather than water. Johnsongrass control 10 wk after treatment was better with clethodim at 28 g ha–1 applied in paraffinic oil than when applied in soybean oil, cottonseed oil, No. 2 diesel fuel, kerosene, or jet A fuel. Low air pressures of 14 or 28 kPa resulted in better control of johnsongrass and barnyardgrass than higher pressures of 56 and 112 kPa. Clethodim, fluazifop-P, haloxyfop, quizalofop, or sethoxydim were more effective on johnsongrass and barnyardgrass when applied in paraffinic oil than in water at 2.3 and 4.7 L ha–1 with an air-assist sprayer.

Keywords

Clethodim, (E,E)-(±)-2-[1-[[(3-chloro-2-propenyl)oxy]imino]propyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onefluazifop-P, (R)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidhaloxyfop, 2-[4-[[3-chloro-5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidquizalofop, (±)-2-[4-[(6-chloro-2-quinoxalinyl)oxy]phenoxy]propanoic acidsethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onebarnyardgrass, Echinochloa crus-galli (L.) Beauv. ♯ ECHCGjohnsongrass, Sorghum halepense (L.) Pers. ♯ SORHAGlycine max (L.) Merr. ‘Forrest’Clethodimfluazifop-PhaloxyfopquizalofopsethoxydimSORHAECHCG
Type
Research
Information
Weed Technology , Volume 6 , Issue 2 , June 1992 , pp. 262 - 268
Copyright
Copyright © 1990 by the Weed Science Society of America 

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