184 DISEASES OF TROPICAL PLANTS OH. 



the dead and dying branches and is also parasitic. It is 

 sometimes called the coral-spot disease. The leaves 

 droop, become yellow, die, and fall. The mycelium is 

 primarily in the tracheary tissue. The bark becomes 

 shrivelled, and eventually bright red warts about the 

 size of millet seed are produced. They are bright coral 

 red and very conspicuous, and covered with numerous 

 conidia spores. In time they become brown, and the 

 surface becomes roughened with projecting points. This, 

 or more likely another species of Nectria, occurs in 

 Trinidad, Grenada, and Dominica. It causes a gummy 

 exudation from the bark, and the underlying tissues 

 become discoloured and soft. It is strictly a wound 

 parasite, and girdles the stems very quickly, causing 

 their death beyond the diseased part. Still another 

 Nectria has been reported from Jamaica as having 

 yellow perithecia. 



Nectria Bainii, Massee, of Trinidad, Martinique, 

 and Ceylon, 1 causes semicircular dark blotches on the 

 pods, which become soft and watery at these points. 

 A little later they are covered with yellowish rust- 

 coloured or orange-coloured mycelia, studded with minute 

 red perithecia. The perithecia are preceded by a small 

 snow-white Fusarium-like, mould, which may be the 

 conidial stage. In some localities the natives believe 

 this disease due to sunburn. It has not been recorded 

 as occurring on the stems. 



Nectria iheobromae, Massee, and Calonectria 

 flavida, Massee, both occur as the cause of stem cankers 

 in the West Indies, Trinidad, Dominica, Martinique, 

 St. Lucia, St. Vincent, and Granada, and may work 

 either alone or together. They can be detected at an 

 early stage, but cannot be distinguished one from the 

 other ; the bark becomes dry and greyish brown. It is 

 most easily seen in the dry season just after a rain, 

 because it does not dry so quickly as the surrounding 

 bark, for which reason it is sometimes called the bleeding 



1 The diseases reported from these two widely separated countries may not 

 be due to the same cause, although the descriptions correspond quite well. 



