http://orgprints.org/7274/ Silicas for control of the poultry red mite Dermanyssus gallinae Control of the poultry red mite Dermanyssus gallinae is a challenge for organic as well as conventional egg producers. In organic agriculture, control should be attempted by mechanically acting substances (e.g. oils or diatomaceous earth), before acaricides are applied. Diatomaceous earth (DE) without acaricides was at least as effective as DE supplemented with pyrethrum or essential oils and a liquid formulation of silica in vitro. In on farm experiments, DE was effective during a limited period only, whereas the liquid formulation had a very good residual effect over several weeks. Maurer, Dr. Veronika Perler, Erika 9poultry 7animalhealth veterinary-parasitology int_conf_joint2006_8 eu_qlif_sub4 Silicas for control of the poultry red mite Dermanyssus gallinae 2006-05-10 Maurer, Dr. Veronika and Perler, Erika (2006) Silicas for control of the poultry red mite Dermanyssus gallinae. Joint Organic Congress, Odense, Denmark, May 30-31, 2006. application/pdf