Canada thistle may look beautiful and innocent with its bright yellow and purple flowers towering above North Dakota's crops and prairie grasses, but looks may be deceiving. The plant is an invasive ...

There’s some interesting activity afoot in the cropfields and pastures of Colorado, Utah and Montana, as researchers explore a new biocontrol method for Canada thistle, by delicately sprinkling, ...

Canada thistle (Cirsium arvense) is a creeping perennial broadleaf that is native to the Mediterranean area. It spreads rapidly through underground stems called rhizomes and by producing seeds. It ...

Teliospores of the Puccinia punctiformis fungus are on Canada thistle plants in the late summer and fall. Teliospores of the Puccinia punctiformis fungus are on Canada thistle plants in the late ...