548 
THE TROPICAL AGRICULTURIST. [December i, 1881. 
that whatever disease may linger on through the first 
application would die out during the following two 
applications, before it had time to regain vigour, fruit 
and re-infect the estate. 
"The three applications were given here on the 13th 
May, 23rd June and 30th July respectively, that is 
at about five weeks' interval, this being sufficient time 
for whatever percentage of the fungus had escaped 
one application, to regain vigour, fruit and spread a 
thousand-fold, before the other application followed. 
This experience, of course, enables me now to say 
the treatment must be carried out at a certain time 
and with a certain system and at no other time and 
in no other manner. This much as regards the actual 
prevalence of the disease past and present. — The next 
question we had to consider was, what has been the effect 
of the treatment on the trees generally ? It is with 
regard to this question that we have come to a con- 
clusion which, under the circumstances, must be con- 
sidered a most important and satisfactory one. On my 
very first round through the estate the manager drew 
my attention to the blackening and dying back of 
the branches of the trees (due, as has been proved now, 
almost exclusively to the effect of leaf disease), and he 
stated that this had taken place at Gleneagles to no- 
thing like the extent it had done in surrounding estates, 
aud that a neighbouring planter observed first this 
difference aud pointed it out to him, the manager. 
We have verified this important fact, not only by 
general observation and comparison, but also in detail 
by counting the dead branches on the different 
descriptions of trees 'in the worst bit of that part of 
Gleneagles which has suffered most from grub and 
leaf-disease combined' and compared result by counting 
the dead branches on trees in similar, untreated fields. 
We counted on treated fields on Gleneagles on 
average bad trees 35 primaries and secondaries that 
had died back. On average fair trees, an average of 
9 dead branches only. At one untreated field we 
counted on average bad trees 69 dead branches, on 
average fair trees, 60 dead branches, at another un- 
treated field on average bad trees, we counted 117 dead 
branches, on average fair trees 78 dead branches ; as 
the average fair trees constitute quite 75 per cent of 
the trees in the fields we compared, Gleneagles 
stands with regard to the dead branches on these 
trees as 9 to 60 at one field and as 9 to 78 at the 
other field." 
The manager, in forwarding this report, adds in a 
letter to the firm— 2lst Oct. 1881:— "The figures as 
regards the dying back of the branches are correct 
and nowhere here have we the same extent of bare- 
looking coffee as there is on the estates named by 
Mr. Schrottky." 
The field on Gleneagles above referred to had 
been manured six weeks before this examination, and 
the question came to be considered whether this non- 
dying back of the branches might not have to be 
ascribed to the effeet of the manure. But as this 
dying back is the work of some months, there 
is no room for doubt left that the benefit must be 
ascribed to the carbolized powder treatment. — E. C. S. 
Main results : — A mitigation of the attack ; leaf dis- 
ease worse in adjoining estates ; collateral benefits, 
such as, comparatively speaking, diminished fall of 
leaves and corresponding reduction in the dying back 
of branches, but failure of the main object to keep 
leaf disease practically out of a given area. 
Success so jar of the Carbolized Powder Treatment 
at Qangapitiya Estate, Dumbara Valley. 
The history of the estate : Rather old coffee, generally 
regarded as a nest of leaf disease, reporting very 
bad attacks twice a year, in October and January. 
Extract from the visiting agent's report to Messrs. 
Whittall & Co., 2th April 1881 :— " The coffee is not 
looking well, most of the wood has been spoilt with 
leaf disease." 
II. 
First application of the carbolized powder on 21st 
April. 
About ten days after application: "I examined 
some of the leaves that had a bad attack on them 
(before treatment) and it appeared, as if the lime and 
carbolic was killing or eating up the fungus, and left 
the diseased patch with the same appearance, a3 if 
the leaf disease insect had been feeding and sucking 
out the spores. But some seem still to have escaped." 
Extract from estate report to Messrs. Whittall & Co by 
30th April 1881. L. B. von Donop. 
III. 
"I met Mr. Schrottky this morning at Gungapitiya 
and we examined together the results of the treatment 
here. He considers them most satisfactory, and so far 
as the experiment has gone, I moat certainly agree 
with him. 
"In exposed places such as along roads and ridges 
trees were found very badly affected, but this it 
appears is caused by the powdei-[or rather its vapour,— 
E. C. S.] being blown away from there, as inside for 
every twelve leaves affected, only on one could a living 
fungus be found. The rest of the leaves had a black 
spot, where the fungus had been established. On those 
where the dis-ase had only commenced, a dried up pale 
yellow mark was observable but in both cases (which 
I consider most important), the leaves appeared healthy 
and p-rforming their functions." Extract from a letter 
to Messrs. Whittall & Co., by L. B. von Donop. 
31st May 1881. 
IV. 
" The estate may be said to be free of leaf disease, 
but occasionally two or three trees are found to be 
diseased ; these trees and also those surrounding them 
are at once well powdered with the preparation, so as 
to try and prevent it going any further. ' Extract 
from manager's letter to Messrs. Whittall & Co., 11th 
September. 
V. 
Extract from the Visiting Agent's Report, 28th 
September 1881. 
" Since I was last here the coffee has improved 
very much in appearance, most of it is now looking 
luxuriant and vigorous We scarcely saw a sign of 
leaf disease." 
VI. 
' ' Mr. Schrottky arrived here this morning and we 
had a look round the estate. As I pointed oat to 
Messrs. Whittall and Young on the 28th ultimo, there 
is a little disease on the flat that adjoins the river 
and also on two or three small patches where there is 
heavy crop. It does not seem to have spread, and 
the rest of the coffee may be said to be free from 
leaf disease. In looking back at old reports I find 
that leaf disease has usually been very bad during 
the month of October and at the present time I know 
that there is a great deal of disease in the district." 
The Manager's letter to Messrs. Whittall & Co., 10th 
October 1881. 
VII. 
"The trees are again beginning to throw out new 
wood and the estate may be said to be practically 
free from disease." Extract from manager's letter to 
Mr. Schrottky, 3rd November 1881. 
