Hypodermosis control and simultaneous treatment for fascioliasis in steinfurt, Germany

Abstract For decades, about 30% of the young cattle in the Steinfurt district of the North German Basin were infested with Hypoderma bovis . Compulsory treatment with rotenone between 1934 and 1963 failed to control infestation. When systemic organophosphorous insecticides became available a 3-year scheme was instituted in which all the 6–24-month-old cattle were treated annually, between 15 November and 15 December, with trichlorfon spot-on. At first, the treatment was not compulsory and warble infestation was occasionally found in cattle purchased outside the district. Later, the treatment was made compulsory and since 1966 warble infestation has not been detected in the district.