title: Biology and control of centaurea diffusa lam. and centaurea maculosa lam
abstract: Centaurea diffusa was found to infest 64,079 acres in the semiarid interior of southern British Columbia. C. maculosa has infested an additional 8,420 acres. These weedy plant species are common along roadsides-and in waste places and are spreading rapidly over vast areas of semiarid rangeland. The density of the knapweed species could only be correlated with the degree of soil disturbance and was not correlated with any chemical property of the soil. The knapweeds are not generally grazed by do
journal: cIRcle (University of British Columbia)