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Temperature Effects on Vegetative Growth of Round-Leaved Mallow (Malva pusilla)

Published online by Cambridge University Press:  12 June 2017

Robert E. Blackshaw
Robert E. Blackshaw*
Affiliation:
Agriculture and Agri-Food Canada, Lethbridge, Alberta, Canada T1J 4B1
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Abstract

Vegetative growth response of round-leaved mallow to various day/night temperature regimes was studied under controlled-environment conditions to predict its potential geographic distribution and to develop an effective control program. Round-leaved mallow dry matter production was greatest with day temperatures of 18 to 26 C. Dry matter accumulation was reduced by a night temperature of 6 C but was minimally affected by night temperatures ranging from 12 to 24 C. Regression analysis predicted minimal vegetative growth at mean daily temperatures below 8 C and above 30 C, with optimum growth at 20 C. Partitioning of round-leaved mallow biomass in leaves, stems, and roots was affected by temperature. Maximum leaf weight ratio occurred at low temperatures, 10 C day and 6 C night. Stem weight ratio was greatest at a day temperature of 26 C, with night temperature having little effect. Maximum root biomass occurred with a day temperature of 18 C. Results are discussed in terms of environmental conditions that allow round-leaved mallow to be an effective competitor with crops and potential approaches for its control.

Keywords

Round-leaved mallow, Malva pusilla Sm. ♯ MALPUBiomass partitioningecological rangegrowth analysisweed biologyMALPU
Type
Weed Biology and Ecology
Information
Weed Science , Volume 44 , Issue 1 , March 1996 , pp. 63 - 67
Copyright
Copyright © 1996 by the Weed Science Society of America 

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