FUNGI IMPERFECTI 



325 



XXVII. ANTHRACNOSE OF COTTON 

 Colletotrichum Gossypii Southworth 



Atkinson, G. F. Anthracnose of Cotton. Journ. Mycology 6: 173-178. 



pis. 1 7-1 8. 1 891. 

 Atkinson, G. F. Some Diseases of Cotton. Ala. Agl. Exp. Sta. Built. 41 : 



40-49. figs. p-ij. 1892. 

 Southworth, E. A. Anthracnose of Cotton. Journ. Mycology 6 : 100-105. 



pi. 4. figs. 1-8. 1890. 



Habitat relations. Anthracnose of cotton exists as a malady of 

 some importance upon rich land in some of the cotton-growing, 

 particularly the 

 Gulf, states. It 

 would seem that 

 the fungus is widely 

 distributed, but 

 serious injury is 

 doubtless depend- 

 ent upon local con- 

 ditions. 



The lesions of 

 this fungus are 

 more important 

 when bolls and 

 seedlings are in- 

 fested, but injuries 

 to stems and leaves 

 are not uncommon. 

 Upon the bolls the 

 minute reddish 

 spot at first evi- 

 dent about an infec- 

 tion center rapidly 

 increases in size, 

 the injured area, 

 marked by a red- 

 dish border, becom- 

 ing black and slightly depressed. Many spots may become conflu- 

 ent, so that very irregular outlines may result. As the development 



Fig. 157. 



Anthracnose of Cotton. (After Geo. F. 

 Atkinson) 



