242 DISEASES OF TROPICAL PLANTS en. 



lagenarium, (Pass) Ell. & Hals. ; the blight or wilt 

 caused by Bacillus tracheiphilus, Smith. 



PASSION VINE 



Woody Fruit. This disease has been described by 

 Cobb as follows : 



The portions of the surface which crack generally the 

 lower parts, as the fruit hangs on the vine turn to a dirty 

 white or very light russet colour, and the surface cracks off in 

 thin layers, leaving a rougher and more russet surface ; that is 

 to say, a dry corrosion takes place. Before the dirty- white area 

 cracks away its margin is sometimes separated from the green 

 and intact parts of the fruit by a green area, where the cells 

 seem to have collapsed without losing their green colour. If 

 a fruit showing the foregoing appearances is plucked, it will, 

 after forty-eight hours, begin to " crinkle " on the green parts, 

 but will remain unchanged in the woody parts remain quite 

 hard, dry and woody. 



Macrosporium Rot. This disease of the ripe or half- 

 ripe fruits has been described by Cobb as follows : 



Spots which at first are greenish on the purple background 

 of the fruit, later turn brownish or buff, and show a somewhat 

 concentric arrangement of slightly varying colours. Ultimately 

 the skin or shell of the fruit becomes very thin and brittle at 

 the diseased spot, and caves of its own accord as the result of 

 some slight accident. 



Either this or another species of Macrosporium is 

 said to be the cause of a leaf-spot disease. There is 

 also a Gloeosporium rot of the leaves, and a shot-hole 

 disease of the leaves. 



VANILLA 



Although a number of fungi have been reported on 

 the vanilla, the information concerning their importance 

 is very meagre. The most destructive, so far as known 

 at the present time, is Calospora vanillae, Massee, 

 which has three stages, the Hainsea, 1 Cytospora, and 



1 This stage is also said to be a synonym of Gloeosporium vanillae, Cke. & 

 Mass., which has been reported on the orchids Onicidium and Dendrobium. 



