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work is not yet complete. Practically all infected estates have been 
visited at least once, often more frequently, and have been given 
advice as to treatment of the disease. 
The black line disease, Ustulina zonata, being comparatively 
new, has given planters some trouble and many have asked the 
inspecting officers to visit their estates and given advice about it. 
It is now fairly well known and on many estates the removal of all 
timber, especially thinned [out rubber stumps and trunks, is being 
carried out on all the older fields. The question *is under 
consideration as to whether the inspecting staff ought not to use 
its powers to require the removal of at least all dead rubber wood 
from all estates in the interest of the industry as a whole. This 
treatment would apply also to the other root disease of older rubber, 
Poria hypolaterita, about which advice is often asked. 
White ants, Fomes , Sphterostilbe repens, die-back, drying up of 
latex and various bark troubles all give rise to requests for advice 
from time to time and inspecting officers are more and more 
frequently asked to visit estates to advise on the treatment of one 
disease or another. 
Recently, that is from the middle of 1916 to date, much atten- 
tion has been given to two bark diseases. The first is the “ black 
stripe” also known in Perak as “cambium rot,” first found in 
Perak North. The Assistant Agricultural Inspector, Perak North, 
has, I believe, determined its distribution on estates fairly fully in his 
portion of the State and is also assisting the Mycologist with experi- 
ments to determine its treatment. This disease, occurring as it does 
on renewing bark is a very important one, and work on its distribu- 
tion in other States has been commenced. It is known to occur here 
and there in Selangor in the districts of Kuala Selangor, Klang and 
TJlu Langat and in the Raub and Kuantan districts of Pahang. So 
far it has probably been recorded from the Negri Sembilan only on 
one estate, as it seems preferable to considerable bark disease known 
there on several other estates to be different, since it exhibits certain 
differences in symptoms and may not be due to the same fungus. 
The second bark disease referred to is this form found in the 
Negri Sembilan. Its distribution on estates has been fairly fully 
determined by the Assistant Agricultural Inspector, Selangor, and 
the Assistant Agricultural Inspector, Negri Sembilan. On the 
suggestion of the management tapping was stopped on one area in 
which this disease occurred. 
Census of Coconut Trees. 
It may he mentioned in passing that a full census of coconut 
trees on small holdings has been nearly completed by the inspecting 
officers and that the advisability of making a census of rubber 
holdings to show ages and trees is under consideration. 
