Hyphomycetace^e. 



MlJCEDINE^E. 



PELLICULARIA KOLEROGA, Cooke. 

 (Leaf Rot of Coffee). 



The disease was first noticed in Mysore, S. India, where 

 it was known as leaf rot or " Koleroga " ; later, Dr. Ernst 

 found it in Venezuela, and more recently it has been 

 observed in Trinidad and Jamaica. 



The fungus covers the leaf with a filmy, gelatinous 

 matter ; the mycelium is external. The affected leaves turn 

 black, rot at their tips and fall off. 



A knowledge of the life-history of this species would be 

 interesting. 



The addition of some fungicide, such as sulphur, liver of 

 sulphur, etc., should act as a preventitive. 



Diagnosis : Effuse, greyish-white, covering the whole 

 leafs surface ; conidia globose, hyaline, echinulate, 7*5 

 microns diameter, inserted laterally, sessile. 



Massee : Kew Bulleti?i, 1893, p. 67, 



Hart : West Ind. Comm. Circular, Vol. XXIV., p. 510. 



RAMULARIA AREOLA, Atk. 

 (Areolate Mildew of Cotton.) 



The disease was described by Mr. Atkinson from the 

 United States in 1896. The mildew is confined to areolate 

 portions of the leaves, the spots being limited by the vein- 

 lets and presenting a frosted appearance. It seems probable 

 that the fungus can only do damage to the older leaves. 



Diagnosis : Spots on the under side of the leaf, rarely 

 on both, pale at first, then darker in colour, 1-10 mm. 

 broad, irregular, bounded by the veins of the leaf; hyphae 

 in small fascicles, many-septate, hyaline, 25-75 by 4*5-7 

 microns; conidia oblong, 1-3 times septate, formed in 

 chains, 14-30 by 4-5 microns. 



Lewton-Brain : West Did. Bull., Vol. IV., p. 63. 



STOCKDALE : West Did. Bull, Vol. VIII., p. 159. 



53 



