The biology of Canadian weeds. 130. Amaranthus retroflexus L., A. powellii S. Watson and A. hybridus L.

By M. Costea, S. Weaver, F. Tardif. 2004

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Temperature effects on germination and growth of redroot pigweed (Amaranthus retroflexus), Palmer amaranth (A. palmeri), and common waterhemp (A. rudis) (2003, background): “This response is not surprising because Amaranthus species are C4 plants (Weaver and McWilliams 1980).”
Mutations in ALS confer herbicide resistance in redroot pigweed (Amaranthus retroflexus) and Powell amaranth (Amaranthus powellii) (2005, background): “Common waterhemp is a dioecious, obligate cross-pollinating species belonging to the Acnida subgenus, whereas redroot pigweed and Powell amaranth are part of the Amaranthus subgenus and are monoecious and mostly self-pollinating (Costea et al. 2004; Mosyakin and Robertson 1996; Sauer 1955).”
Conventional- and conservation-tillage systems influence emergence periodicity of annual weed species in canola (2003, background): “This may be primarily a result of higher temperature requirements for germination of these two species in comparison with the other weed species and canola (Blackshaw et al. 1981; Martin et al. 2000; Weaver and McWilliams 1980).”