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Response of Yellow Starthistle (Centaurea solstitialis) and Grass Biomass to Grass, Picloram, and Fertilizer Combinations

Published online by Cambridge University Press:  12 June 2017

Larry L. Larson  and
Michael L. McInnis
Larry L. Larson
Affiliation:
Dep. Rangeland Resources, Oreg. State Univ., OSU Agric. Program, EOSC, LaGrande, OR 97850
Michael L. McInnis
Affiliation:
Dep. Rangeland Resources, Oreg. State Univ., OSU Agric. Program, EOSC, LaGrande, OR 97850
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Abstract

A 2-yr study was conducted to evaluate the response of yellow starthistle density and grass biomass to combinations of newly seeded grass, picloram, and fertilizer. A combination of ‘Tualatin’ tall oatgrass or ‘Paiute’ orchardgrass with 0.14 or 0.28 kg ae/ha of picloram effectively controlled yellow starthistle and improved forage production. Grass seeded alone or combined with fertilizer neither controlled yellow starthistle nor improved forage production. Three-way combinations of grass, picloram, and fertilizer did not affect yellow starthistle density in either year but resulted in more ‘Tualatin’ tall oatgrass biomass in 1987.

Keywords

Picloram, 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acidorchardgrass, Dactylis glomerata L. ♯3 DACGLtall oatgrass, Arrhenatherum elatius (L.)Beauv. ex J. & C. Presl. ♯ ARRELyellow starthistle, Centaurea solstitialis L. ♯ CENSOPoa compressa L. ♯ POACO
Type
Research
Information
Weed Technology , Volume 3 , Issue 3 , September 1989 , pp. 497 - 500
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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