All depends on what you spray and how much you spray. We spray all the time by air plane.
Call O'Brians flying service in Iowa and they will spray down there. You got to get the chemical across the road from G&H seed. They could tell you how much chemical and at what rate to use.
Need to know what your spraying as far as plants go.
If it's just water hyacinth then you could do 2-4D and some generic glyphosate would do the trick.
.5-1 gallon an acre would take care of it.
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