416 



SOUTHERN FIELD CROPS 



Dry weather checks the progress of the disease, and it 

 may then appear only as a reddening or spotting of the sur- 

 face of the boll without serious damage to the crop. 



FIG. 183. ANTHRACNOSE ON COTTON BOLLS. 



No method of spraying for the prevention of boll-rot 

 has been devised. But since anthracnose develops most 

 rapidly in the shade, preventive measures consist in (1) ad- 

 mitting the maximum amount of sunlight by widening 



