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Tom from Woodclilff Lake, Nj writes

Can BTI Mosquito Dunks be used in koi ponds?

Is Talstar P harmful to fish?


BTI Mosquito Dunks can be used in fish habitats as long as it is containerized water (not for use in natural bodies of water).  One briquet will treat 100 sq ft of water.  Talstar P, like most insecticides, will be harmful to fish if it gets into the pond. According to the Talstar product label: "This pesticide is extremely toxic to fish and aquatic invertebrates. Do not apply directly to water, to areas where surface water is present or to intertidal areas below the mean high water mark. Drift and run-off from treated areas may be hazardous to aquatic organisms in neighboring areas. Do not contaminate water when disposing of equipment washwaters. Care should be used when spraying to avoid fish and reptile pets in/around ornamental ponds."

Answer last updated on: 05/30/2018

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