Water hiacinth is some crap!! But we use Diquat if we spray from the boat. If I spray from the plane I use generic roundup. 1 gallon to the acre. Works great and not to expensive. Spray no more than2 times a year. Any more than that then you start having other plant invasive species such as salvania and pickerel weed start to magnify. This is just what we have learned and do in our marsh. It changes from time to time but I know everyone is going to have their different solutions.
Biggest thing is to stay on top of it year after year. If you miss a year it may not hurt. But anymore than two years and it's harder to get back. Best time to spray is in late July. You can kill it and shouldn't have any serious growth for the rest of the year because he growing season ends in September.
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