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Loss in Yield of Rapeseed (Brassica napus, B. campestris) Caused by Perennial Sowthistle (Sonchus arvensis) in Saskatchewan and Manitoba

Published online by Cambridge University Press:  12 June 2017

Diether P. Peschken ,
A. Gordon Thomas  and
Robin F. Wise
Diether P. Peschken
Affiliation:
Agric. Canada Res. Stn., Regina, Saskatchewan S4P 3A2, Canada
A. Gordon Thomas
Affiliation:
Agric. Canada Res. Stn., Regina, Saskatchewan S4P 3A2, Canada
Robin F. Wise
Affiliation:
Agric. Canada Res. Stn., Regina, Saskatchewan S4P 3A2, Canada
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Abstract

Field studies were conducted in 1979 and 1980 to determine yield losses caused by perennial sowthistle (Sonchus arvensis L. # SONAR) in rapeseed (Brassica napus L., B. campestris L.) fields in Saskatchewan and Manitoba. The relationship between percentage yield loss and density of perennial sowthistle was expressed by the linear regression equation y = −3.81 + 13.76 rdx. Weed survey data indicated that perennial sowthistle occurred in 39% of the rapeseed fields but infested only 7% of the hectares surveyed. Using both the survey data and the yield loss equation, the average annual loss in rapeseed yield was estimated to be 9.4 million kg in Saskatchewan and 6.1 million kg in Manitoba, with a value of 2.6 million and 1.7 million dollars (Cdn.), respectively. Perennial sowthistle occurs with a similar frequency and density in other crops so that the total loss from this weed would be much greater.

Keywords

Weed surveyseconomic losscompetitionSONAR
Type
Research Article
Information
Weed Science , Volume 31 , Issue 5 , September 1983 , pp. 740 - 744
Copyright
Copyright © 1983 Weed Science Society of America 

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References

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