more. The Fusarium found is apparently the same as causes a 

 "dainping-off" of tomato and eggplant seedlings. 



Blight (Bacterium pJmseoli Sm.). — While this disease has not 

 Been definitely identified by exact methods, there can be liut little 

 doubt of its presence on northern varieties, but fortunately to a very 

 limited extent only. 



Rust (Uromyces appendiculatus [P.] Lk.) — The bean rust is 

 known to occur on the Island, but has not been collected on the culti- 

 vated bean at this Station, although of common occurrence on several 

 of the wild legumes (Phaseolvs adenanthus, Vigna repens), etc. It 

 forms very small, but numerous brown powdery eruptions on leaves 

 and pods. It is not of sufficient importance to warrant control 

 measures. 



Root Rot or Wilt. — As many as four types of root rot or wilt 

 are reported (5, 1). Cercosporium (?) heticola is given as the pos- 

 sible cause of one form. No further notes are given. This type of 

 disease has not been observed during the present investigations. 



Beet (Beta vulgaris). 



The leaf spot [Cercospora heticola Sacc.) has ])een the only dis- 

 ease so far obsen-ed on this host. The death of mature leaves was 

 somewhat hastened, but no further damage resulted. The spots were 

 numerous, of the same appearance on both sides of the leaf, circular, 

 brown at first, but later dull gray to dirty white, with definite red- 

 brown margins. The Swiss chard {Beta vulgaris var.) was also at- 

 tacked, whenever the leaves were allowed to come to maturity. 



Cabbage (Brassica oleracea) . 



Cabbage remained comparatively free of disease, altliough not 

 making a very satisfactory growth. A soft, putrid, bacterial rot 

 destroyed individual plants which had been injured in cultivating. 

 Diseases due to Pseudomonas canipestris, Plasmodiophora brassicae, 

 Peronospora parasitica, and Macrosporium brassicae are mentioned 

 by Henricksen (5), but are not definitely re]iorted as found in 

 Porto Rico. 



Celery (Apium gravenlms) . 



Celery was slightly attacked by rootknot (Heterodera radicicola), 

 whicli is described in detail later. Leaf spot due to Septoria petro- 

 srliiii Desm. was not found. 



98 



