We have many crested breeds and have to treat for mites. The very best thing that we have found that works every single time is Frontline spray. You can get it online, from a vet, or possibly a pet store. It comes in a spray bottle and lasts a loooong time if you follow this dosing. Put it in a contact rewetting drop bottle, visine dropper bottle, etc. Somone I know also puts it in a medicine cup and then uses a q-tip dipped in it to apply. You need to get the medicine down to and onto the skin for it to work. One drop in the crest or back of head. One drop under each wing in the armpit, and one at the base of the tail near the vent. This will kill most within 24 hrs, if it's really bad it might take 48. After 3 or 4 days you can wash out the crud that they built around the feather bases. Wait a day or two after washing and then reapply the drops to keep it from coming back. You can also use this same stuff for scaly leg mites, just spray it right on the legs. I'll include a link to show you exactly what you are looking for. It looks pricey, but like I said, it will last a very long time and it was well worth the price. http://www.amazon.com/Frontline-Spray-500mL/dp/B0002J1G02
Sevin dust. http://ohioline.osu.edu/vme-fact/0018.html You'll need to not only dust your chickens but also their house, nests, roosts. Redust everything in 10 days including your chickens to kill any eggs that have hatched after the first dusting.
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Could I make up a liquid solution of water/dust to spray in their coop? Not trying to hijack the thread, but glad it was brought up as I am having the same problem.
For an active infestation I use Ivermax pour on for cattle ( 5mg ivermectin per ml) I put 0.3ml on the back of the neck for my standard chickens and guineas,(throw away the eggs for two weeks or boil, grind and feed back to them). Then I dust them with sevin, clean coop, and dust it with sevin. Ten days later I clean coop and dust with sevin again.
For maintenance, I use the ivermax pour on once a year, and dust the coop with food grade diamatacious earth whenever I clean it. It has worked for me, and the birds do fine.
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They still do. I just dusted my birds and pens this weekend and saw the liquid Sevin as a 22% formula, where as the dust has been cut back to only 5% now (used to be 10%)
It still works great, is dirt cheap, easy to get, and pretty much harmless.
I see people who recommend all sorts of stuff for mites and lice, but Sevin has been doing it just fine for many decades now, that's all I use.
Ivermectin is great too, but is some kind of expensive, and it's not going to do a bit of good for the ones on the ground, in the bedding or on the house/coops.
That's why I use Sevin, cheap, easy to find, easy to use.