DISEASES OF CACAO 99 



portions of trees cut away as soon as seen, and destroyed. 

 If such measures as are here indicated are carefully carried 

 out, control of " Brown Rot," " Die-back," &c., can be 

 readily established, and a disease which is a source of 

 great danger may in future be looked upon with composure. 

 It may be pointed out that Howard refers to a root disease 

 as present in Grenada. C. A. Barber (1892-3) also reports 

 a root disease to be present in Dominica, which also attacks 

 other plants, and mentions a similar 

 disease in Jamaica on cacao and coffee. 

 Stockdale (1908) refers to a root disease 

 under the head of Lasiodiplodia on the 

 streingth (apparently) of a specimen sent by 

 the writer, which according to our examin- 

 ation should be referred to Diplodia cacaoi- 

 cola P. Henn, the same fungus as causes the 

 " Brown Rot " of the pod. At present 

 there appears nothing under the head of fiq. 30.— Detached 

 "Root Disease" which has been specifi- p°°'dia or spores from 



. ^ the pustule (Fig. 28) 



cally or even generically determmed, ex- x400. N. Bainii. 

 cepting the specimens above mentioned ; 

 which it may be possible to conclude were infected only 

 with Diplodia cacaoicola, which may perhaps be shown 

 later to be Botryodiplodia and Lasiodiplodia, notwith- 

 standing the distinctions at present laid down which 

 separate these fungi. One experiment made by the writer 

 showed the production of a distinct stroma containing 

 perithecia in colonies, produced by artificial cultivation in 

 " culture fluid," and infected from a cacao pod attacked 

 by veritable " Brown Rot." 



In all writings on " Root Disease " it does not appear 

 that anything has yet been definitely determined, and 

 only preventive and hygienic measures have yet been 

 suggested. It may be, however, that several " Root 

 Diseases " other than Diplodia will be discovered attacking 

 cacao, but these yet await the efforts of the investigator. 



Nos. 5 and 6. "Thread Disease." 5, Pellicularia 

 Kaleroga, Cooke 6, Undetermined, — ^The occurrence of 



