they say dont spray insecticide but i do .. Bifen in a pump up sprayer .. i spray everything around and in the coop, bushes and the ground .. dont get it on their food and dont get it in the water and the birds themselves should be removed or roamed until its dry .. incidentally the nasty neighbors with their worm ridden flea bitten and fly infested animals are my main problem .. their filth flies rats fleas mosquitos etc come over the fence to my yard .. so i spray everything down from the fence over every couple months, more often if it rains alot ... but its proven to be a game changer, only thing i would warn about is a) dont spray it in wind and get in on yourself, wear long sleaves/ pants and i shower after using the stuff, its toxic wet, after drying its safe, cept for insects .. and b) dont get it anywhere near fish tanks reptile pets, OR baby chicks, their bedding etc .. other than that it will solve your issue .. not real cheap but worth it, goes a long way .. DONT try to mix it strong, if anything slightly weaker than recommended on the paper, it works residually, insects touch it, clean their feet and die ... its not a contact kill spray ..