| A 2-year survey of the incidence cf nosema disease of the honey bee in South Australia bas shown that a spring peak of infection may be expected each year. The level of infection is at a minimum in midsummer and winter but a rise may occur in the autumn. It was considered that the disease, either in the form of a few infected bees or of spores on the combs, was present in all hives throughout the survey. Significant differences in the level of infection between hives in the same apiary suggested that there may be factors, varying in some way from hive to hive, which determine the level of infection within each hive. In view of the appreciable variation between hives it is evident that the incidence of the disease in individual hives was estimated with... |
