PLATE 80 



Onion smudge: 



Onion sets (White Portugal variety) naturally infected with Colletotrichum cit' 

 cinans. Collected on August 27, 1919, several weeks after harvest, at Morton Grove, 

 111. Photographed September 23, 1919. Note in the three lower bulbs the small 

 sunken spots in the fleshy scales which mark the early stages of invasion of the living 

 tissue. Natural size. 



(722) 



