666 Philippine Journal of Science 1919 
in the orchard. The diagram, fig. 2, shows the number and lo- 
cation of diseased trees at that date. 
DISCUSSION OF RESULTS 
The text figures (figs. 1 and 2), showing the orchard with 
distribution of the spray plats, indicate perhaps most clearly the 
control obtained. To summarize, however: 
In October, 1917, there were upon Plats I, III, and IV twenty- 
six trees affected with pink disease. At the same time in the 
unsprayed plats, II and V, there were fifteen cases of pink 
disease. ) 
In August, 1918, the middle of the warm rainy season, no 
case was found in pruned and sprayed Plats I, III, and IV, 
the results amounting to effective and complete control. In 
untreated Plats II and V the fifteen cases of pink disease had 
increased to eighteen cases, in addition to which two trees, re- 
corded in 1917 as having pink disease, had been killed as a 
result of the attacks by the disease. 
_ The junior writer has observed control attempts on rubber in 
British North Borneo by pruning and disinfection methods alone. 
Such attempts appeared to give fairly satisfactory results with- 
out the accompanying spraying. However, the value of spraying 
_is demonstrated by several cases observed at the Lamao orchard. 
In September tree 6, row 10, of this orchard was badly affected 
and nearly girdled with pink disease on the trunk. Because it 
was a large, valuable tree the station superintendent did not 
wish to have it entirely destroyed; and in deference to his wishes 
the tree was left, although its recovery appeared very improbable. 
Nevertheless, at every spraying period this lesion was given a 
strong application of the fungicide. In the last observation, 
August, 1918, the tree was in fine growing condition, and al- 
though in the middle of the rainy season the mycelium had not 
reappeared. 
A similar experience was had with tree 8, row 11, exhibiting 
a very bad case of pink disease on the trunk and forks, where 
spraying resulted in the complete recovery of the tree. Trees 
in the unsprayed rows that showed similar attacks were killed 
within a short time. 
Very similar results on rubber are reported by Rickatds 3 as 
having been obtained in the Federated Malay States by painting 
- * Richards, R. M., Diseases of the leaves and stem of Hevea brasiliensis 
in the Malay Peninsula, Proc. First Agr. Conference Malaya, Kuala Lumpur 
(April 25, 1917) 45-47. 
