334 



Diseases of Economic Plants 



The causal fungus is spread by the ways suggested 

 under soil diseases. The disease is now known in most 

 of the Southern States from North Carolina to Florida, 

 and west to Texas, and is yearly noted in new lo- 

 calities. 



Fig. 176. — Nematode galls on roots of Unknown cowpea. After 

 Lewis. 



Owing to the all-important position the cowpea occupies 

 in southern agriculture as a nitrogen crop, where the best 

 rotation demands its frequent recurrence upon the same 

 soil, the disease is of peculiar moment. 



No remedy is known except the use of the Iron cowpea or 



