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Effect of Spray Volume and Pressure on Postemergence Johnsongrass (Sorghum halepense) Control

Published online by Cambridge University Press:  12 June 2017

Chester G. McWhorter  and
James E. Hanks
Chester G. McWhorter
Affiliation:
Appl. Tech. Res. Unit, Agric. Res. Serv., U.S. Dep. Agric., Stoneville, MS 38776
James E. Hanks
Affiliation:
Appl. Tech. Res. Unit, Agric. Res. Serv., U.S. Dep. Agric., Stoneville, MS 38776
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Abstract

Fenoxaprop, fluazifop/fluazifop-P, haloxyfop, and quizalofop at 0.14 kg ai ha−1 and sethoxydim at 0.28 kg ai ha−1 were applied broadcast over-the-top in spray volumes of 94 and 374 L ha−1, each at 138 and 345 kPa, to control johnsongrass in soybeans over a 5-yr period. The two spray volumes provided equal control, but control was better when treatments were applied at 345 kPa than at 138 kPa. There were no significant interactions among herbicides, spray volumes, or spray pressures. Most of the spray was deposited on the upper surface of the plant canopy. Less than 10% of the herbicide spray applied penetrated into the canopy onto water-sensitive spray cards located 10, 20, 30, or 40 cm above the ground.

Keywords

Fenoxaprop, (±)-2-[4-[(6-chloro-2-benzoxazolyl)oxy]phenoxy]propanoic acidfluazifop, (±)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]-oxy]phenoxy]propanoic acidfluazifop-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-onesoybean, Glycine max (L.) Merr. ‘Forrest’johnsongrass, Sorghum halepense (L.) Pers. # SORHAFenoxapropfluazifopfluazifop-Phaloxyfopquizalofopsethoxydimspray particledropletspray coveragesoybeanSORHA
Type
Research
Information
Weed Technology , Volume 7 , Issue 2 , June 1993 , pp. 304 - 310
Copyright
Copyright © 1993 Weed Science Society of America 

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