The control of commensal rodents in Britain 1

Rattus norvegicus and Mus domesticus are the only significant commensal rodents in Britain, though Rattus rattus is also present in a few places. R. norvegicus is by far the most important pest of agriculture. No recent quantitative information is available on the status of rodent infestation, damage or control, though these are generally considered to be satisfactory and to have altered little in the last few years. In particular, there seem to be no infestation problems of practical significance that cannot be adequately resolved by currently available control techniques. Recent developments of practical interest include the occurrence of rodent damage to the plastic bags in which big bale silage is preserved, low‐grade resistance to difenacoum in R. norvegicus in one locality, and the continued introduction of improved rodenticides. New legislation has been introduced giving government comprehensive powers over the use of pesticides, under which rodenticides must now be assessed for safety, efficacy and humaneness. Responsibility for research, training and extension in rodent control has largely been devolved to the private, academic and local government sectors, with central government now undertaking these activities only on a commercial basis. The nature and significance of these changes is discussed.