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Round-leaved Mallow (Malva pusilla) Growth and Interference in Spring Wheat (Triticum aestivum) and Flax (Linum usitatissimum)

Published online by Cambridge University Press:  12 June 2017

Lyle F. Friesen
Affiliation:
Dep. Plant Sci., Univ. Manitoba
Kenneth P. Nickel
Affiliation:
presently Field Crops Agrologist, British Columbia Ministry of Agriculture, Fisheries and Food, Fort St. John, British Columbia, Canada, V1J 5X8
Ian N. Morrison
Affiliation:
Dep. Plant Sci., Univ. Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2

Abstract

Round-leaved mallow interference in spring wheat and flax was investigated under field conditions in southern Manitoba. Additionally, the growth of mallow alone and in a wheat crop was compared. In six of seven trials, wheat yield losses due to mallow interference were not significant. In a seventh trial, where mallow densities of up to 237 plants m−2 were recorded, wheat yields were reduced up to 15%. In contrast, significant flax yield losses occurred in each of three trials where maximum mallow densities ranged from 21 to 52 plants m−2. From the regression equations it was calculated that 20 mallow plants m−2 caused flax yield losses of 33, 9, and 10% in 1987, 1988, and 1989, respectively. Periodic sampling of mallow plants growing alone and in wheat, and regression analysis of these data using a logistic function as a biological model of plant growth indicated that mallow growth was severely suppressed by wheat By the eighth week after emergence, the lamina area and shoot dry matter of mallow plants growing in wheat was less than 3% of plants growing alone. Similarly, in wheat, mallow produced less than 1% of the seed produced by plants growing alone. This extreme suppression of mallow growth corresponded with an 80 to 90% decrease in photosynthetically active radiation penetrating the wheat canopy for approximately six continuous weeks, beginning 4 wk after crop emergence.

Type
Weed Biology and Ecology
Copyright
Copyright © 1992 by the Weed Science Society of America 

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References

Literature Cited

1. Frankton, C. and Mulligan, G. A. 1987. Weeds of Canada. Agric. Can., Ottawa, ON. Publ. 948. Pages 120121.Google Scholar
2. Freund, R. J. and Littell, R. C. 1986. SAS System for Regression. SAS Inst. Inc., Cary, NC. Pages 133141.Google Scholar
3. Friesen, L., Morrison, I. N., Marshall, G., and Rother, W. 1990. Effects of volunteer wheat and barley on the growth and yield of flax. Can. J. Plant Sci. 70:11151122.Google Scholar
4. Gubbels, G. H. 1978. Interaction of cultivar and seeding rate on various agronomic characteristics of flax. Can. J. Plant Sci. 58:303309.Google Scholar
5. Hume, L. 1985. Crop losses in wheat (Triticum aestivum) as determined using weeded and nonweeded quadrats. Weed Sci. 33:734740.Google Scholar
6. Koutsoyiannis, A. 1977. Pages 8191 in Theory of Econometrics. 2nd ed. MacMillan Education Ltd., London, U. K. CrossRefGoogle Scholar
7. Kvalseth, T. O. 1985. Cautionary note about R 2 . Am. Stat. 39:279285.Google Scholar
8. Makowski, R.M.D. 1987. The evaluation of Malva pusilla Sm. as a weed and its pathogen Colletotrichum gloeosporioides (Penz.) Sacc. f. sp. malvae as a bioherbicide. Ph.D. Dissertation, Univ. Saskatchewan, Saskatoon, SK. 225 pp.Google Scholar
9. Makowski, R.M.D. and Morrison, I. N. 1989. The biology of Canadian weeds, 91. Malva pusilla Sm. (= M. rotundifolia L.). Can. J. Plant Sci. 69:861879.Google Scholar
10. Mortensen, K. 1988. The potential of an endemic fungus, Colletotrichum gloeosporioides, for biological control of round-leaved mallow (Malva pusilla) and velvetleaf (Abutilon theophrasti). Weed Sci. 36:473478.Google Scholar
11. Nickel, K. P. 1989. The growth and competitiveness of round-leaved mallow (Malva pusilla Sm.) in spring wheat (Triticum aestivum L.). M. S. Dissertation, Univ. Manitoba, Winnipeg, MB. 79 pp.Google Scholar
12. Silsbury, J. H., Adem, L., Baghurst, P., and Carter, E. D. 1979. A quantitative examination of the growth of swards of Medicago truncatula cv. Jemalong. Aust. J. Agric. Res. 30:5363.CrossRefGoogle Scholar
13. Thomas, A. G. and Wise, R. F. 1983. Weed surveys of Saskatchewan cereal and oilseed crops from 1976 to 1979. Weed Survey Ser. Publ. No. 83-6. Agric. Can., Regina, SK. 260 pp.Google Scholar
14. Thomas, A. G. and Wise, R. F. 1984. Weed surveys of Manitoba cereal and oilseed crops from 1978, 1979, and 1981. Weed Survey Ser. Publ. No. 84–1. Agric. Can., Regina, SK. 230 pp.Google Scholar
15. Thomas, A. G. and Wise, R. F. 1985. Dew's Alberta Weed Survey 1973–1977. Weed Survey Ser. Publ. No. 85-3. Agric. Can., Regina, SK. 134 pp.Google Scholar
16. Thomas, A. G. and Wise, R. F. 1987. Weed survey of Saskatchewan cereal and oilseed crops 1986. Weed Survey Ser. Publ. No. 87-1. Agric. Can., Regina, SK. 251 pp.Google Scholar
17. Thomas, A. G. and Wise, R. F. 1988. Weed survey of Manitoba cereal and oilseed crops 1986. Weed Survey Ser. Publ. No. 88-1. Agric. Can., Regina, SK. 201 pp.Google Scholar