I have lives in Texas my entire life and I hate the weather to death, and yes, the roaches and the mosquitoes are huge here. e_e I am terrified of roaches... and when I tore down my old coop, guess what was living underneath along with that momma rat that was killing my chicks; tons of roaches! nibbling off my chickens poo. I had to have my husband bag up the bedding. I was too terrified to try and pick it up.
I have my araucana hen who has a constant problem with getting poop stuck to her butt, I have ended up just plucking out feathers. I dunno why she has this problem. My fluffier chickens don't.
But I was just wondering if the tea tree oil would be good for them at all. I heard it is great for skin and hair, but i dunno about feathers.