42 



be mentioned later. His investigations hâve been carried 

 on by Wright') and P e t c h. ") 



In the West Indies the canker was first noticed by 

 H art in Trinidad. Some material of diseased trees was 

 forwarded to Massée^), who detected a Nectria on it. 

 In 1901 Howard^) found the disease to be rather com- 

 mon in Grenada and Dominica. A Nectria and a Calonectria 

 were recorded from the affected trees. According to Stock- 

 dale^) the canker in the West Indies is now met with 

 in Trinidad, Grenada, Dominica, St. Lucia and St. Vincent. 



In Java it is also known. Zehntner's^) observations 

 about its mode of occurrence, so much resemble what 

 we saw in the Saramacca district, that I quote part of 

 it hère. 



In visiting some estâtes in 1904 „I found that on one 

 of them the canker had assumed a malignant form. 

 Whereas in 1902 I had not been able to find more 

 than a few cankered spots, so many trees had mean- 

 while died of the disease, that in some fields large gaps 

 had appeared, although cankerspots had been carefully 

 excised and ail measures had been taken to prevent the 

 spread of the disease. The manager had even disinfected 

 the instruments every time a tree had been treated." 



„I hâve not discovered a wholly satisfactory explanation 



t) H. W r i g 11 t. Circulars of the Royal Botanic Garden, Ceylou. 

 Vol. II, N". 18. 1904, p. 279. Vol. II, No. 21. 1904. p. 339. Vol. III, 

 N". 10, 1905. p. 116. 



2) T. Petch. The Tropical Agriculturist. Vol. XXIX, 1907, 

 No. 2. Supplément p. 5. 



3) G. Massée. The Tropical Agricult. Vol. XIX, 1900, p. 478. 



4) A. Howard. West Indian Bulletin. Vol. II, 1901, p. 200. 



5) F. A. S t c k d a 1 e. West Indian Bulletin. Vol. IX, 1908, p. 171 . 



6) L. Z e h n t n e r. Korte Mededeelingen van het Proefstation 

 voor Cacao, No. 11, 1904, p. 4. 



