Agronomy Library > Soil Conservation

Control of Canada thistle and Perennial Sow-thistle in Direct Seeding Systems
Author: Lloyd Darwent, Duane Stevenson and Peter Gamache
Date Created: May 10, 2004
Last Reviewed: May 10, 2004

Canada thistle (Cirsium arvense L.) is a common problem on Alberta farmland, regardless of the type of tillage system used. Infestations of 15 to 20 shoots per square meter can reduce wheat yields by as much as 36 per cent.

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