Yes, sevin dust will take care of palmetto bugs/cockroaches. Both may carry eyeworm eggs/larva that can infect the chickens eye. Once eyeworm infects the chickens eye...the eye swells, is inflammed and watery. Eyelids may stick together. The eye can turn cloudy. The chicken will scratch the eye quite often. Treat with equal parts of valbazen and water (mixed) dropped into the eye. Then dose with 1/2cc valbazen given orally. Repeat both in 10 days. Wild birds that are infected may spread it through a flock as well.