PLATE I 
Varietal resistance to onion smudge. 
White, yellow, and red onions grown in the same field of smudge-infested soil and 
gathered shortly before harvest. In the case of the white (susceptible) variety the 
fungus has already developed abundantly on the outer scale of bulb and neck. In 
the red and the yellow (resistant) varietiesf the colored outer scales have remained 
free from the disease; infection has occmred only at the neck, where little or no pig¬ 
ment developed. 
(1040) 
