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CHALKBROOD TOLERANCE IN THE EGYPTIAN BEES, Apis mellifera lamarckii AND THE CARNIOLAN BEES, A. m. carnica IN EGYPT

: The purpose of the present study is to compare the chalkbrood tolerance of two stocks of honeybee commonly used in Egyptian beekeeping, Egyptian bees, Apis mellifera lamarckii Cockerell and Carniolan bees, A. m. carnica Pollmann. Chalkbrood infection percentages were measured in both races as indicator to chalkbrood tolerance. Mean baseline chalkbrood infection percentage was determined for each stock, followed by three chalkbrood inoculations, each one week apart. Chalkbrood mummies were counted one week after each inoculation and removed. Results exhibit highly significant differences in chalkbrood tolerance between the two stocks. Egyptian race was the highest tolerant one with an average infection percentage of 0.229% after the three inoculations. Oppositely, Carniolan race was the lowest tolerant with an average infection percentage of 0.853%. Generally, tolerance to chalkbrood does occur in some honeybee stocks can be selectively bred.