250 ANNUAL EEPOETS OP DEPARTMENT OF AGRICULTURE. 



phases of treatment, especially for European foulbrood. Attention 

 also is being given to diseases of adult bees. 



Spraying fruit trees : Effect on bees. — Investigation of the effect 

 that the spraying of fruit trees has on bees has been conducted since 

 1914 in cooperation with the Deciduous Fruit Insect Investigations 

 of the bureau. During the year 1917 this work has been done at 

 the Bee-Culture Laboratory at Drummond, Md., it having been im- 

 possible to release a man for work elsewhere on account of the war 

 emergency. In connection with this work some interesting data 

 have been obtained regarding the length of life of adult bees in rela- 

 tion to the honey flow. These will be prepared for publication. 



