You do indeed need to do repeat spraying's. Permethrin does not kill the pests eggs so when they hatch you will have another outbreak. You need to spray inside the coop thoroughly every crack and crevice. I use a gallon sprayer with a wand. It allows me to get the spray into the hard to reach areas. I use the permethrin dust on the birds. Most often it's wild birds who can introduce the unwanted pests. Especially during the summer months I have been spraying once a week. I did a heavier concentration spraying initially. TSC carries the powder, premixed spray and the concentrate.Also, FYI - about Permethrin: I just ran across another thread today, from April of this year, in which people said Permethrin only needs to be applied once, and you only need to apply again if you see parasites on the birds again! I think the thread was called "Spraying with Permethrin", and the member who commented was Dawg (Dawg 53, I think - I do know he's a veteran member, and has always been spot on with this stuff). I was shocked to hear that, but at any rate, I'm going to double check that permethrin is a product that doesn't need at least 3 treatments to break a life cycle.


