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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 ,
Kenneth P. Nickel  and
Ian N. Morrison
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
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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.

Keywords

Round-leaved mallow, Malva pusilla Sm. # MALPUspring wheat, Triticum aestivum L. ‘Katepwa’flax, Linum usitatissimum L. ‘Norlin’Round-leaved mallow interferencemallow growthlogistic functionMALPU
Type
Weed Biology and Ecology
Information
Weed Science , Volume 40 , Issue 3 , September 1992 , pp. 448 - 454
Copyright
Copyright © 1992 by the Weed Science Society of America 

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References

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