( 6 ) 
is growing. The disease is very dangerous on 
account of its subterranean habit, for an attacked 
tree usually blows over before the disease appears 
above soil level. When a tree is found attacked by 
this fungus it may be assumed that a number of 
neighbouring trees are also affected. This disease 
has caused large losses on many of the older planta- 
tions, but is seldom found on young trees. 
The wet-rot of the freshly-dug roots together with 
the inconspicuous brownish lines in the attacked 
tissue serve to diagnose the attacks of this fungus. 
Brown Root disease. 
This is not a common disease on rubber but the 
appearance of attacked roots is quite typical. The 
mycelium of the fungus binds up earth and stones 
in the immediate proximity of the roots to form 
a firm encrusting mass, which is detached with 
difficulty. The Brown Root disease is a common 
feature in other tropical cultivations, e.g. tea, 
coffee, camphor, which will show similar symptoms. 
This disease is under investigation at the present 
time, but little definite information has been ob- 
tained. 
In these diseases, control measures take the form of 
preventing the spread of the disease by trenching 
round the affected areas, removing and burning dead 
wood, and applying lime before supplying. 
Stem and Only two stem and branch diseases 
Branch require to be mentioned, viz. Pink 
Diseases. disease and Die-back disease. 
Pink Disease. 
This disease is caused by a fungus known as 
Corticium salmonicolor, which on Hevea brasiliensis 
shows varied manifestations. Prior to 1912 the 
