massachusetts 

 Agricultural Experiment Station 



TECHNICAL BULLETIN No. 4 NOVEMBER, 1921 



Development and Pathogenesis 



OF THE 



ONION SMUT FUNGUS 



By P. J. ANDERSON 



Onion smut is the most destructive of all onion diseases in 

 New England. In the Connecticut Valley it is probably re- 

 sponsible for more loss to the growers than all the other diseases 

 of this crop combined. This paper embodies the results of funda- 

 mental work on a project having for its chief aim the control 

 of onion smut. Beginning with the germination of the spores, 

 the development of the fungus is followed through the saprophytic 

 stage, infection of the host, distributive stage within the host, 

 and final sporogenesis. 



Requests for Bulletins should be addressed to the 



AGRICULTURAL EXPERIMENT STATION 



AMHERST, MASS. 



