2014 Saskatchewan weed survey

  • Agriculture and Agri-Food Canada

Lead Investigator(s)

Julia Leeson

Lead Investigator(s) Institution

Agriculture and Agri-Food Canada


To measure the species compositions and population densities of the weed communities in the major summer annual crops and identify changes in weed communities that have occurred since previous surveys. To document abundance and distribution of resistant weed species. To document agronomic and weed control practices used on surveyed fields and relate to floristic composition of weed communities.


In 2014 and 2015, a total of 2,242 fields of spring wheat, barley, durum, oat, canola, flax, mustard, lentil, or pea were surveyed. In late summer of each year, weed seed samples were collected from plants that escaped herbicide control in a subset of the fields. All co-operating producers were asked to complete a management questionnaire to assist in interpreting the weed survey results. Green foxtail, wild oat,s and wild buckwheat have been ranked one, two, and three in each survey since the 1970s. Five other species have been ranked amongst the top 20 most abundant species in each survey (Canada thistle, shepherd’s-purse, lamb’s-quarters, stinkweed, and perennial sow-thistle). Since the 1970’s five species have steadily increased: spiny annual sow-thistle, cleavers, barnyard grass species, round-leaved mallow, and canola. Since the 1980’s three species have consistently increased: foxtail barley, dandelion, and narrow-leaved hawk's-beard. Low cudweed, broad-leaved plantain and American willowherb, appeared in the top 25 in the most recent survey. The trends identified by the weed surveys can be used by research, industry, and extension to develop weed management recommendations for producers.

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SPG Contribution


Project Status


Duration/Timeline of Project (Year to Year)

2014 - 2016


Western Grains Research Foundation

Total Project Cost