186 DISEASES OF TROPICAL PLANTS CH . 



the pods. He also states that the one on the stem 

 agrees with Nectria striatospora, Zimm. 



Nectria ditissima, lull., which also occurs on the 

 tea, has been reported on the cacao in Ceylon ; Zimmer- 

 man has recorded N. coffeicola and N. striatospora, 

 Zimm., on cacao stems, and Calonectria cremea on 

 cacao pods in Java ; C. bahiensis, Hempel, occur on the 

 cacao stems in South America ; Chaetodiplodia sp. , 

 occurs on twigs of cacao in Surinam ; and Fusarium 

 album, Sacc. , which is ordinarily considered a saprophyte, 

 may prove to be a wound parasite. 



Van Hall and De Jonge have reported a canker 

 disease from Surinam, due to a fungus, which they have 

 described under the name of Spicaria colorans. It 

 is said to be similar in many respects to the Nectria 

 cankers which occur in Ceylon and Java. 



Nectria camerunensis, Appel and Strunp, and N. 

 iungeri, P. Henn., has been reported on the fruits of 

 cacao in Kamerun. 



The methods of treatment of the Nectria cankers 

 have been the subject of considerable discussion, but it 

 is very evident that the most satisfactory treatments 

 are those which prevent the spread of the fungi. All 

 dead trees should be cut and burned, and all dead and 

 diseased parts of living trees should be cut and burned 

 and the wounds painted with white lead or tar. All 

 diseased pods should be burned or buried. The trees 

 should also be pruned so as to admit free aeration and 

 sunlight. 



Pink Disease. This disease is due to the fungus 

 Corticium lilaco-fuscum, Berk, and Curt., which attacks 

 the younger branches, covering them with a pinkish 

 incrustation of hyphae. It spreads over the surface 

 and penetrates the bark, causing it to crack and peel. 

 A new bark is formed beneath the old bark. However, 

 this new bark is tender and more susceptible to attacks 

 from species of Diplodia, Nectria, and other fungi. 

 The pink disease itself is not considered serious, but its 

 greatest damage lies in that it facilitates the inroads of 



