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Here's info about Elector PSP: https://www.valleyvet.com/Library/lib_39086_-MSDS.pdf

Here you go, scroll down to "Permethrin in the environment," and/or read the whole link: http://npic.orst.edu/factsheets/PermGen.html

You're dealing with cold/freezing temps, correct? I wouldnt spray birds in cold temps nor inside their coop when there is a threat of cold or freezing temps. Permethrin dust and Sevin dust are cheaper.

They are lice. I recommend dusting your birds with Permethrin powder. You will also have to clean out coops and nests and dust them as well. New bedding will need to be dusted. Dust your birds again in 10 days to kill larva hatched from lice eggs. If you see lice eggs on feather shafts on any of...