152 DISEASES OF ECONOMIC PLANTS 



toms to the knot, may be distinguished from it by the 

 absence of warthke growths upon the surface of affected 

 'twigs. 



As an effective measure all diseased canes may be cut out 

 and burned, cutting well below the diseased area. 



Fig. 64. — Currant leaf spot (septoriose). After Stewart and Eustace. 



Septoriose ] [ (Septoria Rihis Desm.) 



\ The leaf spots j 

 Cercosporose J [ (Cercospora angulata Wint.) 



The " currant leaf spot " is a term applied to a peculiar 

 spotting of the leaves of both currants and gooseberries. 

 It is likely to occur wherever these plants are grown. The 

 spot is of rather characteristic appearance, usually circular, 



