You might try washing with Bonners Castille peppermint soap and then using DE. But, one way or the other, you're going to have to handle the hens. Just catch them at night on the roosts and they'll be like zombies. I've even caught semi-wild peacocks and guineas this way.
Only thing with the castille and DE is you may need to do multiple treatments. Even with seven or permethrin you have to retreatr in ten days to get eggs that hatch.
Make sure you keep the coop dusted with DE as well.
Part of prevention is good nutrition. Are they getting plenty of fresh, whole feed? Sprouts, hard boiled eggs, yogurt, berries, squash, stuff that's good for you and lots of variety. Not just stale chicken feed. Boosting the immune system will help them fight parasites, just like young and sickly older cats and dogs are more prone to fleas.
Only thing with the castille and DE is you may need to do multiple treatments. Even with seven or permethrin you have to retreatr in ten days to get eggs that hatch.
Make sure you keep the coop dusted with DE as well.
Part of prevention is good nutrition. Are they getting plenty of fresh, whole feed? Sprouts, hard boiled eggs, yogurt, berries, squash, stuff that's good for you and lots of variety. Not just stale chicken feed. Boosting the immune system will help them fight parasites, just like young and sickly older cats and dogs are more prone to fleas.
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