INFECTIOUSNESS OF BROOD COMBS FROM NOSEMA INFECTED COLONIES.

Experiments have been made for the purpose of obtaining data relative to the likelihood of the transmission of Nosema disease from colony to colony through the medium. of brood-combs. Brood combs on which colonies had died of the disease and others takenfrom colonies heavily infected with Nosema apis through experimental inoculation were inserted into healthy colonies after differentperiods of time had elapsed following their removal.

Infection did not occur in any of the experiments in which brood-combs from Nosema-infected colonies were given to healthy ones. The practical import of theresults is that brood-combs from Nosema-infected colonies need not bedestroyed, but may be inserted without treatment into hives containinghealthy bees with practically no fear that losses will result fromsuch manipulation. 

NOSEMA-DISEASE.
By G. F. White, Specialist in Insect Diseases
UNITED STATES DEPARTMENT OF AGRICULTURE
BULLETIN No. 780
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