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Leafy Spurge (Euphorbia esula) Control with Fall-Applied Imazapyr, Imazaquin, and Imazethapyr

Published online by Cambridge University Press:  12 June 2017

Robert A. Masters ,
Robert N. Stougaard  and
Scott J. Nissen
Robert A. Masters
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Univ. NE, Lincoln, NE 68583
Robert N. Stougaard
Affiliation:
Dep. Agron., Univ. NE, Lincoln, NE 68583
Scott J. Nissen
Affiliation:
Dep. Agron., Univ. NE, Lincoln, NE 68583
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Abstract

Imazapyr, imazaquin, and imazethapyr were evaluated for control of leafy spurge. Herbicides were applied at 70, 140, and 280 g ae/ha in Fall 1989, 1990, or 1991 on a sub-irrigated meadow near Ainsworth, NE and a tallgrass prairie near Columbus, NE. Imazapyr, imazaquin, imazethapyr at 280 g/ha controlled leafy spurge 58, 82 and 73%, respectively, 9 mo after treatment (MAT) at Ainsworth. Leafy spurge control averaged 49% 9 MAT at Columbus where 280 g/ha of the imidazolinone herbicides were applied. Leafy spurge yields were reduced at Ainsworth by 29 and 78% where the imidazolinones were applied at 140 and 280 g/ha. By 11 MAT, leafy spurge control on areas treated with 280 g/ha declined to less than 60% at Ainsworth and 10% at Columbus. Perennial forage grass yields at both sites were generally unaffected by imazaquin or imazethapyr, but imazapyr at 280 g/ha reduced yields by 69 and 44% at Ainsworth and Columbus, respectively. Imidazolinone herbicides applied in the fall partially controlled leafy spurge, but did not increase perennial forage grass yields.

Keywords

Imazapyr, (+)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-pyridinecarboxylic acidimazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidimazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidLeafy spurge, Euphorbia esula L. # EPHESRangelandperennial grassesimidazolinonesperennial weed controlEPHES
Type
Research
Information
Weed Technology , Volume 8 , Issue 1 , March 1994 , pp. 58 - 63
Copyright
Copyright © 1994 by the Weed Science Society of America 

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References

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