232 PLANT DISEASES 



tact when the spores are growing are smooth, whereas the 

 outer, free portion of the surface is coarsely warted. 



PREVENTIVE MEANS. Very little success in this respect 

 attended the efforts of those investigators of the disease, 

 whose primary object was to discover, if possible, some 



1 



\ 



Fig. 58. Hemileia vastatrix. i, portion of a coffee leaf 

 showing diseased patches ; 2, a patch showing sori or 

 clusters of spores, slightly mag. ; 3, spores, x 350. 



means of checking the epidemic. Probably some of the 

 modern fungicides, as Bordeaux mixture, etc., might prove 

 more effective. Diseased leaves should be collected and 

 burned on all occasions. 



Full notes respecting the distribution of the different 

 species of Hemileia^ along with the dangers arising from 

 want of discrimination in the selection of 'shade trees,' 

 will be found on p. 27 of this book. 



Berkeley, Card. Chron., p. 1157 (1869). 

 Morris, The Coffee Leaf Disease of Ceylon and Southern 

 India. 



