I first noticed a small flea problem about a month ago , so I moved the chickens out of that pen , dusted them with poultry dust and vasaloene on their combs and ears , then sprayed the pen with 55% malathion properly mixed in a garden sprayer , day 2 same spray , day 3 same spray , day 4 changed to a hose end sprayer of enforcer brand flea control , primary ingredient in it is permethrin used 2 of those 1 per day , then went to the garden sprayer with the permethrin concentrate , that makes 9 days in a row of vigerous spraying and STILL HAVE FLEAS IN THE PEN . bought 50 pound bag of seven dust and am going to turn ths whole ground white in the pen today , ,any other ways besides DE to control these buggers ,, I used it with complete failure 3 years ago so no more DE will come here ,