Family: Asteraceae

High Risk Traits:

• Broad climate suitability
  
• Thrives in tropical climates
  
• Widely naturalized
  
• Crop weed (esp. no-till crops)
  
• Other Erigeron and Conyza species are invasive
  
• May possess allelopathic properties
  
• May be an allergen to susceptible individuals
  
• Tolerates a wide range of soil conditions
  
• Able to form dense thickets
  
• Reproduces by seeds
  
• Hybridizes with other species
  
• Capable of self-pollination
  
• Annual to biennial (able to reproduce in one growing season)
  
• Seeds dispersed by wind, soil movement, water and human activities
  
• In rare instances, avian seed predators and mammals may internally disperse seeds
  
• Prolific seed production
  
• Seeds can remain viable in the soil for up to 3 years
  
• Herbicide resistance has developed in a number of locations

Low Risk Traits:

• Impacts to the natural environment and ecological processes has not been documented and may not be as significant as impacts to crops
  
• Unarmed (no spines, thorns or burrs)
  
• Palatable to browsing and grazing animals
  
• Not reported to spread vegetatively
  
• Minimum tillage provides effective control