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So true, cats are very sensitive to permethrin/ pyrethrins. Not good for them in amounts that other species can handle. Mary

x2! Permethrin is effective and approved for use in the USA. It's also cheap and available in farm stores everywhere. Mary

I agree, and haven't found this product locally at all. Interesting! I have no problem finding permethrin, and haven't seen spinosad on the FARAD site. Mary

Is it actually labelled for poultry??? I couldn't find anything on it's use in chickens, and if it's not approved for that use, there won't be a withdrawal period, except forever. Mary

Fipronil is approved topically for dogs and cats, and is used on cattle in Brazil. It's also used for insect control in buildings by pesticide companies, and on field crops (no idea about that). It's not used on any food animals in the US, and is very toxic to bees, fish, and aquatic critters...

You can look on the label; there should be directions! Also, FARAD.org and/ or your university poultry experts can help. I think that permethrin now has a withdrawal time, which it didn't used to have. Mary