Hi I have been told tea tree oil is toxic for chickens specialy if used full strength .I read in another forum that someone had killed 8 out of 12 of their chickens this way .The best way I know to treat scale leg mites is wash the legs in warm soapy water use a soft nail brush to clean and soften up the mitegunk between the scales,dry the legs then rub the legs and feet with food type oil or vaseline it dosen't matter what you use as you are suffocating the mites ,do this every day for a week ,then just the oil occasionaly for a while untill the legs look healthy
