DISEASE OF SATSUMA AND MANDARIN ORANGE 

 FRUITS CAUSED BY GLOEOSPORIUM FOLIICOLUM 

 NISHIDA 



Mycologist, Bureau of Science, Manila 



ONE PLATE AND ONE TEXT FIGURE 

 OCCURRENCE AND DISTRIBUTION 



The Unshiu oranges, Citrus nobilis var. unshiu, are loose- 

 skinned fruits closely related to the mandarin oranges and are 

 the most commonly grown citrus fruits in Japan. Until recently 

 the Unshiu oranges were not grown commonly elsewhere than 

 in Japan but in the last twenty years these varieties have been 

 grown in the Gulf States of the United States rather extensively 

 although they are known there as Satsuma oranges According 

 to TanakadO) there are six strains, or perhaps they may be 

 called varieties, of the Unshiu oranges; Owan, Zairai, Ikiriki, 

 Ikeda, Hira, and Wase. 



In September, 1919, a disease was observed upon fruits of 

 the Wase Unshiu orange, at Saigo, Nagasaki Pre feet ure, Japan. 

 In the orchard where it was first observed only two trees showed 

 the disease, the fruits of those two trees however sh ouin g at 

 least 20 per cent of the fruits affected. At Saigo this ^ the 

 first season that the disease had been observed. The disease ^vas 

 next observed in the Arita River Valley, Wakayama Prefecture 

 Two trees oni y f the Wase Unshiu variety were observed but 

 one fruit upon one of these trees showed a typical case of the 

 Wase rot The owner of the trees stated that he had observed 



as yet In this orchard the number of affected frmts «as con 

 servatively 10 per cent of the total crop. ^ 



