It is possible for wind and water to spread them, in that case, some of the problems can be solved by using barriers. Animals can spread the problem as well. There are some ways to help in the management of animal and bird borne weeds, but these may be impractical for most lake owners.
The fact is, that the overwhelming evidence is, that most aquatic weeds are spread by human beings! Usually this is done by boats and trailers. This type of proliferation can and should be stopped! It is a simple matter of checking and cleaning all areas of all boating equipment.
