W. MCtlAE 271 



successful inoculations. They state that the penetration of the wood is usual, 

 deep, and rapid, and both vertical and horizontal spread of the fungus is much 

 more rapid in the wood than in the bark. They have not seen a fruit-rot and 

 presumably not a leaf-fall as they do not mention it. They also report the 

 presence of claret-coloured canker, but the description differs considerably 

 from that of Ceylon, and from a note on water-logged bark there seems to be 

 sime confusion in Malay both in the names and in the descriptions of diseases 

 of the bark. Richards ^' - reported a bark disease, which has the same 

 symptoms as bark-rot, from it isolated a species of PhijtojMiora , and states that 

 from evidence collected it appears that the fungus is not P. Faberi, but another 

 species of the same genus, and is the same as that described by Dastur. He 

 also records the presence of canker. In Malay it seems that bark-rot and 

 perhaps claret-coloured canker are present, but not fruit-rot nor any of the 

 other symptoms noted in South India. There is also another disease, brown- 

 bast, which appears to be similar to that described by Fetch from Ceylon 

 and seen by me in one part of South India. In Richards' paper is an extract 

 from Aher's " Rubber Industry in Brazil and the Orient ", in which is mentioned 

 the fact that a cambium-rot occurs in Brazil. No description, however, is given, 

 so it is not known whether it has any relationship to the bark-rot of the East. 

 In the Tropical Agriculturist for 1914, Vol. XLII, p. 268, there is a reference to 

 an abnormal leaf-fall in Surinam : the fact is simply stated that Hevea drops 

 its leaves twice a year there. Wester '^ writing on rubber culture in the 

 Phihppines mentions stem-canker, bark-rot, abnormal leaf-fall and diseased 

 pods of Hevea among the more serious diseases that have appeared in other 

 rubber-growing countries in the Far East, so they have not been recorded from 

 those islands. There is in the literature some indefiniteness, and very little 

 description of the fungus in the various aspects of the disease caused by 

 Phytophthora, and it would appear that more than one species of Phijtophthora 

 is responsible for them. 



Since this paper was written it was brought to my notice that a culture of 

 P. Meculii sent to Pusa produced resting conidia there soon after its arrival, 

 and has continued to do so in subsequent sub-cultures. They have appeared 

 in French -bean-agar and oat-juice-agar, though never so copiously as in cultures 

 of the Burma Phytophthora on Hevea. Dastur kindly sent me sub-cultures in 



^ Ricliards, RM. Brown Ba>t and Black Tlir. ad. " Ma'.aij Pcnin. A<jric. A^xucn. dr., 



Xo. 1, pp. 4—5, 11)17. 

 2 ,, " r)is(!ase.s of the Leaves and Stem of Hecca braailien-iis in the Malay 



Peninsula." Agric. Bull., F. M. S., V, pp. 312— .S16, 1917. 

 * Wester, P. .J. '• Rubber Culture in the Philiijpin.^s.' Phil Ayric. Review, X, p. 21U, 1917. 



