Are there statistics on which of the 5 herbicide is proven more effective? Also, any data on use on a comparable lake to ours?

NH Department of Agriculture and the herbicide vendor recommend diquat or fluridone as effective for treatment of spiny naiad. The only other lake in NH that has spiny naiad (Milton 3 Ponds) has used diquat for the past 2 years – they report good control, but not elimination. See the Pros/Cons document on the BIPC website for comparison.