As you probably know, control of Typhaea stercorea
the hairy fungus beetle is primarily achieved through the removal of elements that contribute to its infestation. Sanitation, removal of mold, moisture, etc, what controls this beetle. Any insecticide that can be used around chickens will kill the beetle. The problem is usually that the chickens cannot be removed. The application of insecticides to chickens or with chickens present is not recommended. If there is a way to remove the chickens, clean, sanitize and then apply pesticides, then that would be the way to attack the problem. TenGard SFR would be a good product to use - here is a link to the label - http://www.epestsupply.com/labels/ten...
Hope this helps.