DISEASES OF SUGAR CANE 



321 



produced from small stromatic masses on the surface of the spot. 

 The conidia are cylindrical or long elliptical, with very thick 

 walls, olive green to brown in colour, 3-10 septate. 



Red Leaf-Spot. 

 Red leaf -spot, originally described from Java, is recorded 



Fig. 134 Eriosphaeria Sacchari 



From Wakker & Went 



Asci AND Spore 



from the West Indies by Went in Aruba Island and L. H. Gough 

 in Trinidad. It is caused by an ascomycete with round black 

 perithecia and two-celled spores, Eriosphcsria Sacchari Went. 



The spots are roundish except when two or more interfere. 

 They begin as red dots with a yellowish border ; when mature 

 they are reddish-brown, surrounded by a narrow yellow border 

 that is sometimes scarcely visible. The centre of the spot does 



Fig. 



135 Cercospora Kopkei 

 From Wakker 6- Went 



not dry out, which serves to distinguish this affection from eye- 

 spot or ring-spot ; from yellow-spot it differs in the narrowness 

 of the margin. 



Yellow Leaf-Spot. 

 The yellow leaf-spot, which is very generally distributed in 

 Java without being the cause of notable damage, was recognised 

 by Went in Barbados, Trinidad and Demerara. It is caused by 

 Cercospora Kopkei Krug. 



