138 DISEASES OF TROPICAL PLANTS 



CH. 



which is frequently fatal to the tree. Further study 

 may prove this also to be the C. gloeosporioides. 



FIG 



Rust. This disease (Fig. 57) is due to a true rust 



fungus, Uredo fici, 1 

 Cast., which attacks 

 the leaves, producing 

 numerous rust - red 

 spots on the under 

 surface and causing 

 the leaves to fall. 

 This disease is very 

 common in Southern 

 United States and 

 West Indies, and 

 when severe the 

 trees will not bear 

 fruit of any conse- 

 quence. It can be 

 controlled by re- 

 peated sprayings 

 with Bordeaux mix- 

 ture. 



Leaf Blight. - 

 This disease is caused 

 by the fungus Cer- 

 cospora bolleana, 

 (Thuem.) Speg., and 

 appears as leaf spots. It can be controlled by the use 

 of Bordeaux mixture. 



Yellow Rust. This is not a true rust, but a disease 

 due to Fusarium roseum, Link. It is more or less 

 common in Cuba and the Southern United States. It 

 attacks the leaves, causing yellowish spots which break 

 and fall, thus giving the plant a very ragged and 

 unsightly appearance. 



1 Syn. Phykapsora fici, Arthur. 



FIG. 57. Leaf of fig affected with rust, Uredo fici. 

 (Photo by C. W. Edgerton.) 



