Fecha de publicación: 17/07/2001 Fuente: WIPO "hive" An evaporator which provides formic acid vapour at a consistent and repeatable rate for effective treatment of varroatosis in honey bees. The evaporation chamber is heated by an electrical element(s) and maintained at a constant temperature by a mechanical thermostat or electronic control circuit. The amount of vaporised material is controlled by adjusting the temperature setting and metering apertures of the evaporation chamber. A continuous flow of formic acid vapour has been demonstrated to kill tracheal and varroa mites much more effectively than other methods and systems, now in use, which depend primarily on the amount of heat generated within the hive as well as solar radiation and ambient temperatures for their operation. The evaporator is made using materials which are largely unaffected by corrosive chemicals, such as formic acid. All electrical components are protected from moisture and corrosion with a protective coating.