The University of Florida has long been a leader in the research of aquatic plant management and control. They have for years hosted an excellent web site and issues the Aquaphyte Newsletter quarterly. Another thing they do that is invaluable is host a literature data base on topics and articles published on the topic of aquatic plant management.
The Center has announced that they have just updated their web site. It is well worth a look and a bookmark if you have any interest in this subject. We have added this site to our Blog Roll at the right of this page (http://plants.ifas.ufl.edu/). One major enhancement is the addition of over 100 aquatic plant identification videos. You might consider signing up for their newsletter as well, it is a good read.