I've been adding citronella to the nest boxes. Will also dry some mint, lemon balm, have orange and lemon peel to add as well. What are you all using in the nest box as insect deterrents. Since doing this, I've seen no signs of mites. Had an infestation last fall, did 2 clean outs, using DE and permethrin in coop, treated birds x 2 with permethrin and ivermectin. Saw just a couple of mites early spring... all is well now.