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Kochia (Kochia scoparia) and Green Foxtail (Setaria viridis) Interference in Sugarbeets (Beta vulgaris)

Published online by Cambridge University Press:  12 June 2017

Abdelouhab Mesbah ,
Stephen D. Miller ,
K. James Fornstrom  and
David E. Legg
Abdelouhab Mesbah
Affiliation:
Dep. Plant, Soil and Insect Sci., Univ. Wyoming, Laramie, WY 82071
Stephen D. Miller
Affiliation:
Dep. Plant, Soil and Insect Sci., Univ. Wyoming, Laramie, WY 82071
K. James Fornstrom
Affiliation:
Dep. Plant, Soil and Insect Sci., Univ. Wyoming, Laramie, WY 82071
David E. Legg
Affiliation:
Dep. Plant, Soil and Insect Sci., Univ. Wyoming, Laramie, WY 82071
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Abstract

Two field experiments were conducted between 1990 and 1992 under sprinkler irrigation at the Research and Extension Center, Torrington, WY to determine the influence of mixed densities and durations of kochia and green foxtail interference in sugarbeet. Sugarbeet root yield and top weight generally decreased as densities of green foxtail and kochia increased whether alone or in combination. Reductions in sugarbeet root yield and above ground biomass from mixed densities of kochia and green foxtail were additive at the low and intermediate density but less than additive at the high density of either species. Sugarbeet root yield decreased as the duration of interference after sugarbeet emergence from a mixed density of kochia and green foxtail increased. Since sugarbeet plants were irrigated to avoid water stress and adequate nutrients were applied, it appears that kochia and green foxtail interfered with sugarbeet primarily for light, based on light and height measurements. Season-long as well as duration of interference did not show any significant effect on sucrose content. Based on regression analysis the lowest densities of kochia and green foxtail required to reduce root yield were approximately 0.3 and 0.06 plants/m of row, respectively. The minimum duration of time that 0.5 kochia and 3.0 green foxtail plants/m of row can interfere with sugarbeets before root yield is economically reduced was approximately 3.5 wk after sugarbeet emergence.

Keywords

Green foxtail, Setaria viridis (L.) Beauv. ♯ SETVIkochia, Kochia scoparia (L.) Schrad. ♯ KCHSCsugarbeet, Beta vulgaris L. ‘Monohikari.’CompetitionKCHSCSETVI
Type
Research
Information
Weed Technology , Volume 8 , Issue 4 , December 1994 , pp. 754 - 759
Copyright
Copyright © 1994 Weed Science Society of America 

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References

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