Infuence of diet composition on mortality of Cydia pomonella larvae infected with CpGV

Various diets and methods of virus application can be used in bioassays to test the efficacy of Cydia pomonella granulovirus (CpGV) biocontrol agents against codling moth (Cydia pomonella L.). Usually, diet incorporation of virus occlusion bodies (OBs) or application of the OBs on the diets surface is used in bioassays. Here, we compared the effect of three diet compositions, the Ivaldi-Sender diet, Guennelon diet and Manduca Premix-Heliothis Premix, on the mortality of codling moth larvae when CpGV OBs were incorporated into the diets. Statistical differences were found between the mortality of codling moth on the Premix diet and Ivaldi-Sender and Guennelon diets, with a significantly higher median lethal concentration (LC50) value of CpGV-M on the Premix diet. The impact of the diet composition on bioassay results is discussed.