For those who use poultry dust/Sevin, how do you treat the walls and ceiling of your coop, or don't you bother?
I have a hen that's been lethargic, puffed up, has diarrhea coated on her backside and hasn't been eating well for 4-5 days. I've brought her inside my house a few cold nights and had her sleep in a cat carrier in my bathtub. It took me two nights to figure out that the fine dust I saw on the top of the carrier was actually mites. Super gross, and I've since found them on my wrists and forearms.
I've got a small flock of 26 and have thus far been organic, but clearly the DE that I've been applying to the coop regularly hasn't prevented this mite infestation. This winter I've spread straw out on top of the snow for the chickens to walk on, and wild birds are in the straw all the time. That may be what brought on this mite issue.
My flock is aging and I won't have eggs to sell this year anyway, so I'm not as concerned about sticking to organic regulations - and since I found mites on ME, I'm seriously about wiping them out. So yesterday I went to
TSC and bought poultry dust and dusted my sick hen. She's in the cat carrier in my tub again and there are lots of dead mites falling off her, but plenty of live ones too. I'm a bit concerned about how effective the dust is. I'm going to try putting it in a sock like others have suggested, and maybe I'll be able to get a better coating on her.
This hen may have other issues as well; I'm wondering if the mites got bad on her because she's sick with something else and hasn't been dustbathing. I bought her an oral vitamin with iron and amino acids in case she's anemic from the mites. I've managed to get some of that into her, and she pecks at hard boiled egg, but isn't eating much. I may lose her, but I want to address the mite issue with the rest of my flock.
I have an organic insecticide called Pyganic, which is a 5% Pyrethins solution. It's a liquid and I think it will be easier to treat my flock and inside of the coop. It gives instructions on the label for spraying the walls and ceiling of the coop, says to spray it into all cracks and crevices. It says it's not necessary to remove the chickens while doing this, but to take out food and water. Then follow up by spraying each chicken with a fine mist. That sounds a lot easier than trying to catch all my chickens to dust them. And I can spray everything in the coop - roosts, walls, etc. I'm reluctant to do this when it's cold outside because I don't want to chill the chickens, but I guess it's no different than them being out in the rain. And a fine mist won't get them THAT wet. If I go this route, I'm going to do it tomorrow morning so they have the day to dry off.
So, back to my original question: those of you who do use Sevin or some sort of dust, how do you treat the walls of your coop? Or if you treat the hens and the litter, is that enough to eventually kill the mites? The label on my poultry dust indicates to treat the coop at a rate of 1 lb per 40 sf, but it doesn't give further details. It also says not to use in nestboxes, so I'm not sure how to treat that area.