The delta-endotoxin of 12 strains in 10 subspecies of Bacillus thuringiensis Berliner was highly active against Cydiapomonella (L.) when assayed under laboratory conditions on artificial diet. These results could not be confirmed in the field.The disappointing results obtained under field conditions are due to the behaviour of the target insect. C.pomonella larvae do not ingest food during penetration of the fruit. The larva bites pieces of the epidermis and deposits them without ingestion on top of the entry hole.
This chapter relates the research and development of two granulovirus-based insecticides to manage the codling moth, Cydia pomonella, which is a worldwide pest of a number of fruit crops. Madex®, and VirosoftCP4® were registered in Switzerland and Canada, respectively.
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