CITRUS FRUITS 



117 



all varieties and species of citrus, but the lime is the 

 greatest sufferer. In fact, some of the workers who 

 have been studying this disease have expressed to the 

 writer the opinion that the organism is a true parasite 

 on the limes only, and that it does not attack other 

 varieties of citrus fruits when they are in perfect health. 

 However, there can be no doubt that trees w r hich are 

 weakened from other causes are extremely susceptible 



FIG. 52. Limes affected with anthracnose, Colletotrichum gloesporioides. 



to attacks of this disease. Furthermore, the writer is 

 led by his correspondence to believe that the virulence 

 of this organism varies in different citrus-growing 

 districts of the world. The character of the disease also 

 varies somewhat on the different species and varieties. 

 It is found upon trees of all ages, from seedlings in the 

 seed beds to the mature trees. It usually appears 

 first on the tips and edges of the young leaves, and 

 frequently on the petiole, the axil of the leaf forming 

 a good place for the lodgment of the spores. The 



