That would be quite a task for me. I'm an old lady and can't do what I used to do. In several of my coops I can't paint because I can't reach but I did cover everything with the DE including dusting birds which made them look like powdered doughnuts, under the wings around their vents, etc. I put it in the nest boxes on the floors, everywhere I could reach. I have usually, depending on the time of year, 200/500 birds. Not an easy task and the permethrin has worked well. I had an issue with flies and the DE didn't work there either but with the permethrin, no more flies. Some cow ear tags are made with permethrin to help control the flies around the cattle. I use the concentrated permethrin and put it in a gallon sprayer with a wand to reach the hard to reach areas and the dust in their nest boxes. Maybe the climate has something to do with it. It works for me so I'm going to continue to use it.
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