62 
Mr. Belgrave said he would certainly advise such if the disease 
in the place did not exist badly. 
Mr. Jarvis then enquired whether burning of the timber did not 
do more harm than good. 
Mr. Belgrave suggested that burning of the timber in pits 
be adopted as it had proved very successful on some estates. 
Another question asked was did the cutting of roots when 
clearing timber damage the trees. 
Mr. Belcirave was of the opinion that the cutting of a few 
laterals was not of great importance especially if tar was applied. 
Mr. Pinching commenting on the carboliniiim solution of 20 per 
cent, thought it did some damage and recommended not more than 
10 per cent. In regard to Mr. Ellis’s remark that pink disease 
should be caught up early enough, he said that that was the trouble, 
as the disease was not seen until it was too late, and the bark was 
dead by then. He hacl heard from the Mycologist in Ceylon that 
black line canker was not known there, and he thought some 
explanation was, therefore, necessary in regard to the allusion to 
that disease being found in Ceylon. 
Mr. Pinching also asked Mr. Belgrave as to what depth he 
considered stumping should be carried out when thinning out. 
Mr. Belgrave said that two feet should be sufficient. 
Mr. Harrison asked whether timber in peat was liable to carry 
infection. 
Mr. Belgrave replied that one estate on peaty land had 
suffered badly from root diseases. 
Mr. Coombs called attention to flat land and hilly land in their 
relation to disease. Leaf pruning in America and other countries 
was not very much advocated. 
Another member said that he had noticed trees of seven or eight 
years old suffer from pink disease. On one occasion Mr. Sharpies 
(the mycologist) and he had examined a large plantation of three- 
and four-year old trees and found no cases of the disease, but three or 
four years later he found the disease amongst the then young trees, 
which seemed to show that the old trees got the disease first, there 
having been no kampong within a mile of the place. If they said 
that old rubber was less liable to attack it might make planters 
neglect their old trees, and that would do more harm than good. 
Mr. Richards, referring to Mr. Belgrave’s remarks regarding 
Forties, said it was possible to cure a very large number of cases 
by looking for the disease by clearing the soil from roots in the case 
of trees one to five years old and painting with copper sulphate and 
lime wash. 
