In 10 years of hen keeping I have never seen a red mite or louse.
Yesterday was a shock. My front yard chooks are v.old and have all stopped laying. They looked awful, bedraggled moulting but looking much scruffier than normal. I was horrified to find my speckeldy crawling with mites.
I clean them out weekly, use diatom powder in the bedding and scrub out the sheds with Jeyes fluid twicie a year.
Their shed was absolutely full of mites. I cleaned it out, poultryguarded it, lit a really smokey bbq in it and smoked the buggers for over an hour, they were still coming out of the gaps.
Have sprayed again, diatomed and will spray again every few days.
Last winter was too mild to kill them off apparently so it's like a double whammy this year.
Anyone else having similar probs?