98 DISEASES OF TROPICAL PLANTS 



CH. 



PIGEON PEA 



Wilt. This disease, which has been reported from 

 India, was first attributed by Butler to a Nectria which he 

 found on the stems, and it has also been attributed to a 



FIG. 45. Ears of Pennisetum typhoideum affected by Sderospora graminicola. 

 (After Butler, Memoirs of the Department of Agriculture in India, Botany 

 Series, No. 1.) 



variety of Necosmospora vasinfecta (Atk.) Smith, which 

 is said to cause a similar disease of the cotton, but as a 

 result of later investigations Butler has determined it to 

 be due to a Fusarium which he has described under the 

 name of F. udium. It is a soil parasite which probably 

 gains entrance to the plants through wounds, plugs up 

 the tracheary tissues, thus interfering with the free 



