Frog's Bit

Am looking for information on Frog's Bit for my daughter and my Girl 
Guide Company.  We are working on things related to the eco-system and 
they want to study invasive plants.  Would like to know things like where 
it came from, how it first entered Canada, where it first entered Canada, 
how it spreads (mechanism), how it is spreading (pattern), how to destroy 
it, etc.