Chalk brood of honeybees (Apis mellifera) is caused by the fungus Ascosphaera apis. It was first diagnosed in Australia in 1993 and is now endemic in most areas of Australia. Although chalk brood is not usually fatal to honeybee colonies, it can cause substantial production losses. The aims of the present work were to conduct a laboratory study on the efficacy of natural products against the chalk brood fungus Ascosphaera apis, and to develop an appropriate field treatment plan to evaluate any products identified in the first section of the investigation.
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