I've dusting them with insecticide Permethrin 0.25% 4 times. I've supplied them with wood ash they seem healthy but their egg laying is still very few. I have 13 one year old chickens & 4 young ones that started laying. My older chickens in the not so extreme summer have given me 10-13 eggs when not so hot in the summertime. Now its 6-8 eggs is their anything else I could about the mites? Is their egg laying still few because their still suffering from mites? I'm kinda concerned.