Isn’t Rotenone highly toxic to fish? For example, I have a pond in my backyard and any pesticide that is used in the area may very well end up in the pond due to rainfall and runoff. Since you have much experience with Rotenone, do you know what the label states with regard to fish or bodies of water in the area of use?
Well, yes, Rotenone is used in the farm-fishing industry to ‘weed out’ the undesirables, but the average home gardener doesn’t have water on their land and isn’t using Rotenone anywhere near water. Runoff isn’t a problem, but might be if someone is using it in massive quantities on an entire field of cabbages next to a creek, I’d imagine. Highly unlikely, as a large-scale farmer would use something MUCH more toxic. Ugh.
The stuff becomes inert after a short time (as does Round-up) so runoff for the average consumer that sprinkles a cup or so on a row of cabbages isn’t a grave concern. The Eco-Nuts I work with swear by the stuff, and they’re paranoid about EVERYTHING from aluminum in under-arm deodorant (therefor they don’t use it) to being convinced that drinking out of a plastic water bottle is going to kill them instantly. *Rolleyes*
Why would you have runoff from your garden going toward your fish pond in the first place? Was it the only place to site your pond or garden? If so, don’t use any insecticides and just plant more crops because the bugs are going to take a percentage of them until you have your eco-system up to snuff...and having a pond with lots of frogs around to eat bugs is a good thing. :)