1918.] The Fifth Indian Science Congress. elxiii 
This conclusion was accepted by the local officers, and Mr. 
C. G. Trevor, Divisional Forest Officer of Kulu, wrote in 1915 
as follows :— 
““Wherever lopping has been done there you find this 
disease, where no lopping has taken place there the trees are 
sound. I have managed by proving the truth of this to, get 
Government to agree that all Kail (Blue Pine) lopping in 
demarcated forest must cease.” 
These facts indicate that the hyphae frequently found in 
living sap-wood and especially in the roots probably belong to 
another fungus, possibly a symbient, a point which is being 
further investigated. 
7. Among the most difficult fungi to control in the forest 
Root Di , are those which live in the soil and attack 
Sal and Sissoo, CO Ss« 2 destroy the roots of our trees. Two 
of these are particularly injurious in India, 
viz. Polyporus Shoreae which attacks the Sal and Fomes lucidus 
which is particularly destructive to Sissoo (Dalbergia Sissoo). 
Both of these fungi are widely distributed and no efficient 
control measures practicable on a large scale in the forest are 
at present known. There is reason to believe that any factor 
which interferes with the normal intake of water such as 
h 
Where the soil is liable to be badly aerated on account of the 
ed “ 5 
The Sal root fungus, also, although widely distributed in the 
Pal forests of India, so far as is known at present 1s most 
injurious in the wet forests of Assam and Bengal where the 
eae ss tree (Sanialum albwm) which is one of 
: : those obscure diseases sometimes classed as 
Phy Siological and in the case of which no definite causative 
geome insect, fungus or bacterium has yet been discovered. 
j excellent account of this was given to the Science Congress 
ast year at Bangalore by Dr. Coleman, who has pointed out 
