First will compatibilities between BCO's and bumblebees are examined. Further sought shall search for the best method to load as efficiently as possible with the bumblebees BCO "and will be worked with different sub-carriers hereby substances. The internal structure of the main flowering and nabloeiwijzen will be studied paying attention to the production of nectar and pollen in this inflorescences, which may be decisive for the attractiveness for bumble bees. The flower protection with hommelvectors loaded with BCO's will be tested under controlled conditions in greenhouses and then quarantine under orchard conditions, preventive healthy and curative blight diseased orchards.