PLATE 4 
A. —Cultures of Diplodia zeae coming from surface-sterilized com germinating in 
culture dish on 20 cc. of nutrient dextrose agar. Ten kernels are taken from each 
sample and germinated this way. The effect of the parasite is here shown: 40 per 
cent of the kernels are dead, 50 per cent are germinating weak, and only 10 per cent 
are strong. 
B. —Cultures of Cephalosporium sacchari coming from surface-sterilized com on 
nutrient dextrose agar. The arrow points to a culture showing the typical bristle or 
coremial growth. Some of the kernels are so severely infected that slight retardation 
of growth is noticeable. 
Somewhat reduced. 
