ILLUSTRATIONS 
PLATE 1 
Black spot on fruits of Chinese mandarin orange variety. The spots are 
caused by the fungus Phoma citricarpa McAlpine. 
PLATE 2 
Fic. 1. Washington navel orange on which twenty needle punctures have 
been made with tap water. 
2. Washington navel orange on which twenty needle punctures were 
made with an infusion of Phoma citricarpa. Both fruits were’ 
inoculated at the same time and held under the same conditions. 
PLATE 3 
Fic. 1. Phoma citricarpa on glucose agar slant, showing black restricted 
growth; twenty days from planting. 
2. Phoma citricarpa on potato plug; twenty days from planting. 
PLATE 4 
Fic. 1. Phoma citricarpa on a plate of standard nutrient beef agar + 1, 
fourteen days after planting, showing restricted growth; natural 
size. 
2. Conidiophores and conidia of Phoma citricarpa McAlpine, x 500. 
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