UREDO GOSSYPII, LAGER. 

 (Cotton Rust.) 



The fungus was first recorded in South America 

 (Ecuador) and has since been seen in the West Indies ; it 

 has recently caused considerable damage to cotton in the 

 United States. In the West Indies, however, the disease 

 does not appear to be a dangerous one. 



All green parts of the plant are affected by the fungus. 

 On the upper surface of attacked leaves small, purplish- 

 brown, roundish or angular spots appear ; they may be 

 scattered or confluent in large groups. The leaves dry up 

 and become brown. 



Diagnosis. Sori formed below the epidermis, then burst- 

 ing forth; spores ovoid or pyriform, 24-30 by 15-18 

 microns ; epispore equally thickened, pale yellow, echinu- 

 late ; paraphyses clavate. 



LAGERHEIM : Journal of Mycology, Vol. VII., p. 48. 



LEWTON-BRAIN : West Ind. Bull., Vol. VI., p. 117. 



HEMILEIA VASTATRIX, BERK. AND BROOME. 

 (Coffee Leaf Disease.) 



This fungus was responsible for the damage done to the 

 coffee industry of Ceylon from the year 1875 to the year 

 1885. It is now widely distributed through the coffee- 

 growing countries of the Old World - India, China, Malay 

 Peninsula, East Indies, Philippines, Natal and German 

 East Africa. 



The disease in its early stages is indicated by the 

 presence of discoloured spots which are more or less 

 circular in shape ; these continue to increase in size, become 

 pale yellow and are studded with bright yellow clusters of 

 spores which eventually become orange-coloured. The 

 spores are confined to the under surface of the leaf. 



In addition to the leaves the young shoots and even the 

 fruit may become spotted. 



All diseased material should be carefully burnt, and it is 

 likely that treatment with Bordeaux mixture would prove 

 effective. 



Diagnosis. Pustules orange, then rufous ; spores sub- 

 reniform, attached obliquely at the base, with convex free 

 surface closely warted and with the two lateral surfaces 

 which are in contact smooth, 35-39 by 10-14 microns. 



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