VI 



TEA 179 



originate as white swollen cushions, and spread over the 

 surface as flattened plates. When mature, these plates 

 are grey in colour, concentrically zoned, and marked 

 with minute black dots. They lie close to the stem, and 

 are attacked at one point only, the point of origin. 

 The under surface is black, and the entire structure is 

 hard and brittle. Two kinds of spores are produced. 



Other Root Diseases. Hymenochaete noxia and 

 Botryodiplodia theobromae are also the causes of 

 important root diseases. There are also many other 

 root diseases which are imperfectly understood, among 

 which is the white root, said to be caused by an un- 

 determined species of Polyporus. 



Other Diseases. Other fungi which have been 

 reported on the tea are 



ON LEAVES 



Pestalozzia palmarum, Cooke. 

 Hendersonia theicola, Cooke. 

 Septoria theae, Cavara. 

 Cercospora theae, Van Breda. 

 Disco sia, Cavara. 

 Phyllosticta, Speschnew. 

 Macrophoma, Speschnew. 

 Helminthosporium theae, Bernard. 

 Guignardia theae, Bernard. 

 Stilbellum theae, Bernard. 

 Macrosporium commune, Raban. 

 Pleospora theae, Speschnew. 

 Coleroa venturioides, Speschnew. 

 Ckaetophoma Penzigi, Sacc. 

 Venturia Speschnewii, Sacc. 

 Gloesporium theae, Zimm. 

 Gloesporium thea-sinensis, Minyake. 



ON STEM 



Stilbum nanum, Massee. 

 Corticium javanicum, Zimm. 

 Corticium theae. 

 Necator decretus, Massee. 



ON ROOTS 



Trametes theae, Zimm. 

 Dematophora necatrix, Berlese. 

 Protomyces theae, Zimm. 

 Hymenochaetae sp. (probably H. noxia}. 

 Rosellinia bothrina, Fetch. 



