The biology characteristic and harmfulness of Conyza canadensis in Dongting area

In this paper,the alien species of Conyza canadensis in Dongting area was studied, its biology and harmfulness characteristic were revealed, stem and leaf growth rule, accompanying plant, distribution, propagate types and hazards causes were analyzed comprehensively. This plant had characteristics such as abord distribution, batter adaptability, faster reproduction and grave hazard to crop. This paper provided important information for comprehensive control and utilization of C. canadensis.