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Herbicide Effects on Established Yellow Old World Bluestem (Bothriochloa ischaemum)

Published online by Cambridge University Press:  20 January 2017

Keith R. Harmoney ,
Phillip W. Stahlman  and
Karen R. Hickman
Keith R. Harmoney*
Affiliation:
Kansas State University Agricultural Research Center, Hays, KS 67601
Phillip W. Stahlman
Affiliation:
Kansas State University Agricultural Research Center, Hays, KS 67601
Karen R. Hickman
Affiliation:
Biological Sciences, Fort Hays State University, Hays, KS 67601
*
Corresponding author's E-mail: [email protected]
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Abstract

Nine herbicides were tested in a field trial during 2001 and 2002 for the ability to suppress growth of established plants of yellow old world bluestem (OWB) that had invaded native vegetation in central Kansas. Herbicide treatments were applied to OWB at the V4 stage of growth using the Nebraska staging method. At 9 wk after treatment (WAT), plots treated with imazapyr at 1.40 kg ai/ ha had much lower OWB plant frequency than the untreated plots, and plots sprayed with imazapyr and bromacil at 7.84 kg ai/ha had much lower OWB tiller densities than the control plots. Imazapyr and glyphosate at 3.36 kg ai/ha provided greater OWB control than other herbicides. At the first frost after treatment application, imazapyr and bromacil treatments continued to have lower OWB frequency and tiller density than the control plots. Visible herbicide control was closely related to end-of-season yield (R = −0.97). Imazapic at 0.16 kg ai/ha, glyphosate, sulfometuron at 0.21 kg ai/ ha, bromacil, and imazapyr controlled OWB from 54 to 94%. Split applications, altered timing of herbicide application, or varied rates of herbicides that exhibited suppressive potential may further improve efficacy of these herbicides.

Keywords

Bromacilglyphosateimazapicimazapyrsulfometuronyellow bluestem, Bothriochloa ischaemum (L.) Keng # DIHISBiomassfrequencynative vegetationold world bluestemsuppressiontiller densityCRP, conservation reserve programOWB, old world bluestemWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 18 , Issue 3 , September 2004 , pp. 545 - 550
Copyright
Copyright © Weed Science Society of America 

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Footnotes

∗ Publication 03-309-J Kansas Agricultural Experiment Station Journal Series.

References

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