Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/31491
Title: Amaranth (Amaranthus spp.): Weed management guide for Australian vegetable production
Contributor(s): Coleman, M  (author); Kristiansen, P  (author)orcid ; Sindel, B  (author)orcid ; Fyfe, C  (author)
Publication Date: 2021-04
Open Access: Yes
Handle Link: https://hdl.handle.net/1959.11/31491
Open Access Link: https://www.une.edu.au/__data/assets/pdf_file/0008/378188/une-weeds-amaranth.pdfOpen Access Link
Abstract: 

Amaranthus species are annual (or occasionally perennial) herbaceous plants, native to the Americas, that can grow up to 2 m in height. Here, we discuss A. viridis (green amaranth) and A. retroflexus (redroot amaranth).

There are approximately 60 Amaranthus species worldwide, of which 20 are found in Australia. Specific identification is best achieved based on differences in leaves, branches and flowers.

Green amaranth leaves are alternate, between 3-9 cm in length and 2-6 cm in width, oval to triangular in shape, smooth, and darker green on the top of the leaf. Flowers are brownish-yellow, about 1 mm in length and found at the end of plant stems. Seed is discshaped, shiny brown or black, and approximately 1 mm in length. Plants grow up to 2 m in height.

Redroot amaranth can also grow up to 2 m in height, and has a red-pink tap root. Leaves are alternate, oval to egg shaped and up to 10 cm in length, with more prominent veins than green amaranth. Flowers are numerous, greenish, and seed is oval to egg shaped, somewhat flattened, shiny black or dark brown, and approximately 1 mm in length.

Young plants can bear some resemblance to blackberry nightshade (Solanum nigrum) and fat hen (Chenopodium album), but with experience can be identified by their cotyledons and first true leaves.

Publication Type: Book
Publisher: University of New England
Place of Publication: Armidale, Australia
Fields of Research (FOR) 2008: 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
Fields of Research (FoR) 2020: 300409 Crop and pasture protection (incl. pests, diseases and weeds)
300202 Agricultural land management
Socio-Economic Objective (SEO) 2020: 260505 Field grown vegetable crops
HERDC Category Description: A2 Authored Book - Other
Extent of Pages: 11
Appears in Collections:Book
School of Environmental and Rural Science

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