Fly and gnat repellent??

[SilkieLady608]

I live in southeast NC so gnats, flies, mosquitos, and all other insects are pretty bad here. Last year I had a mini Rhode island red that got ate all up by gnats, she ended up getting chicken pox and passing away. I'm determined for none of my chickens to have to go through that again. I've tried homemade remedies and diy natural essential oil spray and none of it works. These bugs mean business down here. So what can I use to spray all inside of their coop and on the ground? And even possibly on them? I've found a few products but would love some input. Thanks in advance

 

[casportpony]

For flies, I would use a 10% permethrin concentrate like the Gordon's you have pictured.