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Revegetating Leafy Spurge (Euphorbia esula)-Infested Rangeland with Native Tallgrasses

Published online by Cambridge University Press:  12 June 2017

Robert A. Masters  and
Scott J. Nissen
Robert A. Masters
Affiliation:
USDA, Agricultural Research Service, Department of Agronomy, University of Nebraska, Lincoln, NE 68583
Scott J. Nissen
Affiliation:
Department of Bioagricultural Science Pest Management, Colorado State Univ., Ft. Collins, CO 80523
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Abstract

Degradation of Great Plains rangelands can be linked to past management practices that reduced native species diversity and accelerated establishment and expansion of exotic weeds and less desirable native species. Leafy spurge is an exotic perennial weed that infests more than 1 million ha in the northern Great Plains and reduces rangeland carrying capacity by competing with desirable forages and causing infested areas to be undesirable to cattle and wildlife. Research was conducted to determine the feasibility of using herbicides to suppress leafy spurge and other resident vegetation, which facilitated planting and establishment of native tallgrasses. Four experiments were conducted where 0.28, 0.56, and 0.84 kg ai/ha imazapyr and 0.1 kg ai/ha sulfometuron were applied alone and in combination and 0.84 kg ai/ha glyphosate was applied to leafy spurge-infested range sites in fall 1991 near Ainsworth, NE, and in fall 1991, 1992, and 1993 near Ansley, NE. Research areas were burned about 200 d after herbicide application to reduce plant residue. Monoculture stands of big bluestem and switchgrass were then no-till planted in each experiment and indiangrass was no-till planted in experiments initiated at Ansley in 1992 and 1993. Yields of the planted grasses, leafy spurge, and other vegetation were measured in August at each location starting the year after planting. Imazapyr was an essential component of treatments applied before planting to facilitate establishment of highly productive stands of the tallgrasses. Generally, yields were maximized by fall treatments of 0.28 kg/ha imazapyr + 0.1 kg/ha sulfometuron for big bluestem, 0.84 kg/ha imazapyr for indiangrass, and 0.84 kg/ha imazapyr + 0.1 kg/ha sulfometuron for switchgrass. Yields of the planted grasses were frequently four times greater where these herbicides were applied compared to where glyphosate or no herbicide were applied. Leafy spurge yields were usually reduced in areas where tallgrass yields were greatest. The sequential combination of suppressing vegetation with fall-applied herbicides, burning standing dead plant residue, then no-till planting desirable native tallgrasses in the spring increased productivity of these leafy spurge-infested range sites.

Keywords

Imazapyr, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-pyridinecarboxylic acidglyphosate, N-(phosphonomethyl)glycinesulfometuron, 2-[[[[(4,6-dimethyl-2-pyrimidinyl)amino]carbonyl]-amino]sulfonyl]benzoic acidleafy spurge, Euphorbia esula L. #3 EPHFSbig bluestem, Andropogon gerardii Vitman ‘Pawnee’ # ANOGEindiangrass, Sorghastrum nutans (L.) Nash ‘Holt'switchgrass, Panicum virgatum L. ‘Trailblazer’ # PANVIBiological diversityprescribed firegrassland restorationimazapyrglyphosatesulfometuronnative plantswarm-season grassescool-season grassesSE, standard error of the mean
Type
Symposium
Information
Weed Technology , Volume 12 , Issue 2 , June 1998 , pp. 381 - 390
Copyright
Copyright © 1998 by the Weed Science Society of America 

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