Resistance tests and field trials with bromadiolone for the control of Norway rats ( <i>Rattus norvegicus</i> ) on farms in Westphalia, Germany

Abstract

BCR tests based on the use of the INR and baselines are suitable for determining the incidence and for assessing the level of resistance in populations of Norway rats. The majority of rats of the Westphalian resistant strain, characterised by the Y139C marker in VKOR, are resistant to bromadiolone under practical control conditions.