ot 



Biirretti) attributes to one and the same fungus {La- 

 siodiplodia) the „brown rot" of the pods and the canker 

 (red rot) of the stem (a« appears from his description of 

 the symptoms.) This statement can hardly be correct ; it 

 is true, that Lasiodiplodia (most .probably identical with 

 Howard 's Diplodia and perhaps with v. H ail 's Chaeto- 

 diplodia) does cause the „brown rot" of the pods and 

 also a stem-disease; but this stem-disease is the so-called 

 „die-back:", which is quite différent from the Ceylon can- 

 ker, induced by Spicaria-Fusarium. I mention this because 

 this mistake may give rise to confusion. For the same 

 reason Barrett's use of the term „canker in its broad 

 sensé to include the destruction of w^oody tissues by any 

 parasitic fungus", is not to be recommended, now, that 

 the name canker has already been given to a definite disease. 



Treatment of the Disease. 



Carruthtrs not only tried to combat the disease by 

 treatment (jf affected trees, but also by removing the 

 conditions which assist in spreading it. As he regarded 

 dampness of the atmosphère as the most dangerous factor 

 on account of the favourable conditions it offers to the 

 fungus, he urged before ail things the necessity of re- 

 moving superfluous shade and of draining the soil, espe- 

 cially in low hollows. Besides this he advised the planters 

 to burn the dead trees and to bury or burn ail discoluu- 

 red pods in order to destroy the infection-material. As 

 suckers were scarcely ever affected, he recommended not 

 to eut them ail in the usual way. 



The direct treatment of the trees was to consist in the 



1) 0. W. B an- et t. Agriciiltural Society of Trinidad and To- 

 ago. Societ)' Paper. No. 280, p. 4 and 5. 



