High stability and no fitness costs of the resistance of codling moth to Cydia pomonella granulovirus (CpGV-M).

Resistance against the biocontrol agent Cydia pomonella granulovirus (CpGV-M) was previously observed in field populations of codling moth (CM, C. pomonella) in South-West Germany. Incidental observations in a laboratory reared field colony (CpR) indicated that this resistance is rather stable, even in genetically heterogeneous CM colonies consisting of both susceptible and resistant individuals.