Biology and control of another important weeds of the Czech Republic: Canadian fleabane - Conyza canadensis (L.) Cronquist.
C. canadensis grows well especially on light soils and dry locations in Czech Republic. It reproduces only generatively. Ripened achenes show good germination rates. C. canadensis achenes are positively photoblastic and can germinate also under conditions of high salinity and low water availability. Plants emerge from soil surface and upper soil layers only. Individuals that emerged during spring finish their life cycle in the same year while those that emerge during autumn mostly overwinter at leaf rosette stage and continue to grow in spring. C. canadensis is relatively susceptible to majority of herbicides and so it is not a problematic weed on arable land. Populations resistant to triazine herbicides and to glyphosate can be found in many countries.