West Nile Virus - Will permethrin harm my fishpond?
The amount of permethrin that is likely to enter an outdoor pond or any other body of water after spraying is very low. Therefore, it is not likely to harm the fish in your outdoor pond. At higher levels, permethrin can be toxic to fish. If you wish to reduce exposure, you can cover your fishponds with a tarp before spraying. Do not leave tarps on long enough to cause overheating or a decrease in oxygen. Some people may prefer to bring their fish to a tank inside.

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3. West Nile Virus - What happens to permethrin in the environment?
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11. West Nile Virus - Will permethrin harm my fishpond?
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