THE BIOLOGY OF CANADIAN WEEDS.: 63. Sonchus asper (L.) Hill and S. oleraceus L.
- 1 July 1984
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Plant Science
- Vol. 64 (3) , 731-744
- https://doi.org/10.4141/cjps84-100
Abstract
Spiny annual sow-thistle (Sonchus asper (L.) Hill) and annual sow-thistle (S. oleraceus L.) are introduced weeds which occur in the agricultural regions of all Canadian provinces, but are most abundant in disturbed habitats in southern Quebec, Ontario, and British Columbia. They occur on a wide variety of substrates and are common weeds of waste places and gardens. Their intermittent and prolonged emergence period, rapid development to maturity, and production of large quantities of highly-dispersive seeds make them difficult to control. Details of the morphology of the annual sow-thistles, their reproductive biology (including previously unpublished material on population dynamics and seed production), their response to parasites, and methods of control are presented.Key words: Biology of Canadian weeds, Sonchus oleraceus, Sonchus asperKeywords
This publication has 1 reference indexed in Scilit:
- Seed production by an arable weed communityWeed Research, 1982