— 26 - 



SUMMARY. 



1. Cacao-canker has been present in the Dutch East Indies for niany 



years. The damage done to the cacao-plantations in Java is not so 

 serious as the damage reported from Trinidad and Ccyion. 



2. The theory of Rorer and Petch, that Phytophthora Faberi Maubl. is 



the cause of both the canker and fruit-rot of cacao, could be con- 

 firmed. 



3. Phytophthora-rot of the fruits is not frequent in Java. 



4. Both in cankered bark and in diseased fruits the Piiytophthora is 



closeiy foliowed by Nectria (Fusarium). in the fruits sometimes 

 also by Thyridaria (Diplodia). 



5. The measures, to be recommended, are the following : 



a. Giving access to air and iight by thinning out and pruning the 

 cacaotrees as wel! as the shade trees. 



b. coliecting and destroying the diseased fruits. 



c. scraping off the diseased parts of the bark. 



(/. spraying the stem and branches with Bordeaux mixture. 



6. Phytophthora Faberi Maubl. also causes canker on Hevea, intcrplanting 



of cankered cacao with Hevea is therefore not advisable. 



