Barrier Louse Powder is for the control of all kinds of lice on poultry. Can be sprinkled on the birds paying particular attention to the neck and rear end areas, can also be sprinkled in the house. We recommend liberal, regular sprinkling in the bedding used in the nest boxes as a preventative measure. For use in both Organic and Intensive Farm Systems. Contains Australian Tea Tree Oil 1.5% and Lavandin Oil 1.5% with Sterilizable Maize as a carrier. Does not taint eggs; Does not contain pyrethrum.