RRAC
Background Definition of Resistance Objective Proper use Resistance Management The Future
RRAC and its objectives
Definition of Rodenticide Resistance
The term rodenticide resistance has several interpretations. The one adopted by RRAC is that of Greaves - 1994 (Resistance to Anticoagulant Rodenticides. In: Buckle A.P. and Smith R.H. eds. "Rodent Pests and their Control", CABI, Wallingford, Oxon, UK, pg. 197-217):

"Anticoagulant resistance is a major loss of efficacy in practical conditions where the anticoagulant has been applied correctly, the loss of efficacy being due to the presence of a strain of rodent with a heritable and commensurately reduced sensitivity to the anticoagulant."