DISEASES OF LEGUMINOUS PLANTS 343 



ducing a black stroma throughout the affected bark, with long- 

 necked perithecia in dense clusters more or less united at the base, 

 ejecting both from these and from adjacent pycnidia white 

 tendrils of unicellular spores, the former coffin-shaped, the latter 

 oval or oblong. Infection experiments, made in dry weather, 

 gave negative results. J. A. Stevenson records the existence of 

 an undescribed but serious stem canker in Porto Rico, and a 

 disease closely resembling that described above occurs in Trinidad 

 and Tobago. 



A wilt disease, apparently due to infestation of the roots, occurs 

 sporadically in Barbados. 



Rust. 



The rust fungus Uromyces Dolicholi Arthur, occurs on the 

 leaves of pigeon pea in Trinidad and Porto Rico, and is probably 

 to be found in the intervening islands. It produces small dark 

 brown pustules, with powdery spores, on the lower side of the 

 leaves, and causes discoloration of the foliage. 



