Answer
May 21, 2013 - 08:16 AM
Viper Insecticide is Cypermethrin, once of the most toxic pesticides that we carry. It is excellent for Spider control, but not around lakes and certainly not around Koi. Unless you want the Koi to end up like the spiders.
The only product I can recommend is Mosquito Barrier. It is Super Garlic Concentrate. It works on spiders too. Don't spray it into the water, and be careful of drift.
Anything else including Essentria IC3, and all other organics could kill your Kio. Sorry.
Hope this helps.
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