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Sunflower (Helianthus annum) and Velvetleaf (Abutilon theophrasti) Interference in Sugarbeets (Beta vulgaris)

Published online by Cambridge University Press:  12 June 2017

Edward E. Schweizer
Affiliation:
U.S. Dep. Agric., Crops Res. Lab., Colorado State Univ., Fort Collins, CO 80523
Larry D. Bridge
Affiliation:
U.S. Dep. Agric., Crops Res. Lab., Colorado State Univ., Fort Collins, CO 80523

Abstract

Intraspecific interference of populations of sunflower (Helianthus annuus L.) and velvetleaf (Abutilon theophrasti Medic), as well as interspecific populations of these two broadleaf weeds, in sugarbeets (Beta vulgaris L. ‘Mono Hy D2′) was determined in 2-yr field experiments. Sunflower was more competitive in sugarbeets than was velvetleaf. At densities of 6, 12, 18, and 24 sunflower plants/30 m of row, root yields were reduced 40, 52, 67, and 73%, respectively. At the same densities of velvetleaf, root yields were reduced only 14, 17, 25, and 30%, respectively. Interspecific interference of these two broadleaf weeds at the same densities reduced root yields 19, 36, 43, and 56%, respectively. The minimum number of weeds required/30 m of row to reduce sugarbeet root yields was predicted to be 1 for sunflower, 9 to 12 for velvetleaf, and 2 to 7 for an equal population of sunflower and velvetleaf.

Type
Research Article
Copyright
Copyright © 1982 by the Weed Science Society of America 

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References

Literature Cited

1. Association of Official Agriculture Chemists. 1955. Pages 564568 in Official Methods of Analysis. 8th ed. Washington, DC.Google Scholar
2. Carruthers, A. and Oldfield, J.F.T. 1961. Methods for the assessment of beet quality. Int. Sugar J. 63:7274, 103–105, 137–139.Google Scholar
3. Donald, C. M. 1961. Competition for light in crops and pastures. Pages 282313 in Mechanisms in Biological Competition. Soc. Exp. Biol. Symposia 15. Academic Press, New York.Google Scholar
4. Oliver, L. R. 1979. Influence of soybean (Glycine max) planting date on velvetleaf (Abutilon tbeophrasti) competition. Weed Sci. 27:183188.CrossRefGoogle Scholar
5. Schweizer, E. E. 1973. Predicting sugarbeet root losses based on kochia densities. Weed Sci. 21:565567.CrossRefGoogle Scholar
6. Schweizer, E. E. 1981. Broadleaf weed interference in sugarbeets (Beta vulgaris . Weed Sci. 29:128133.Google Scholar
7. Staniforth, D. W. 1965. Competitive effects of three foxtail species on soybeans. Weeds 13:191193.Google Scholar
8. Zimdahl, R. L. 1980. Weed-crop competition, a review. Int. Plant Prot. Center, Oregon State Univ., Corvallis. 195 pp.Google Scholar