Dermanyssus gallinae eradication approach – application of inert compounds and integral animal health protection

The generally accepted approach to D. gallinae control is based on the control of infestations. The reduction of D. gallinae infection to an accept- able level can temporarily prevent its harmful effects on the health status of poultry. However, the reduced number of D. gallinae continues to persist in poultry environment resulting in an intensive increase of infestation rate and consequent transmission of infectious and contagious diseases. Con- trary to suppression, the eradication approach completely eliminates D. gal- linae thus improving general health status of the flock and providing the control of infectious and contagious diseases associated with this organism and eliminating other adverse effects. Biological efficiency and selection of inert compounds was performed in laboratory conditions. The previous ex- perience with application of SiO2 formulations in practice confirmed the possibility of successful eradication in 8 cases (combined application of liq- uid and powdered form). New generation of inert compounds (P 547/17) showed a range of superior properties as compared with SiO2 formulations, especially in view of high and long-lasting residual effects on non-absor- bent surfaces. In laboratory conditions, after 7 months, the layer formed by a 20% working emulsion on a metal substrate exhibited efficiency of 92% after 1-hour exposure. In clinical conditions, the presence of mites was not detected even after 6.5 months of the settlement of the flock. Clinical tests of inert oils are still ongoing, but their high potential for the eradication of D. gallinae The eradication of D. gallinae is highly complex procedure, which cannot be performed at all times and in all conditions. The conditions for the eradication of D. gallinae using inert compounds include adequate hy- gienic preparation of the facilities while still empty, adequate application of selected compounds, and then adequate ambient temperatures which leads to increase of mites activity. The program of D. gallinae control includes procedures for the preparation, implementation, eradication checks, and prevention of re-infestation.