It is appropriate, in any rodent management programme, that those who undertake the control have an expectation of the time-scale over which control is to be achieved. As far as the anticoagulants are concerned, an appropriate initial time scale for field control might be set at 14 – 35 days. If control is achieved within this time then targets and expectations have been met.
If however the records indicate that rodent activity is still present after this period, then it is appropriate for a review to be undertaken to determine possible reasons for the prolonged treatment. This review should include not only those undertaking the rodent control operations and running the programme, but also those who manage and are responsible for the site at which the control is being undertaken.