THE ANNALS OF APPLIED BIOLOGY. VOL. VI, NO. 1 



PLATE II 



(a) 



FUr 1. 



(6) 



(a) Diseased leaf of Protea cynaroides showing two types of bacterial spots, rai.sed blister- 

 like spots at A and sunken spots at B. 

 (6) The same leaf photographed through an orthochromatic hght filter. 



(a) 



Fig. 



(6) 



(a) Leaf of Protea cynaroides artificially infected by means of "prick" inoculations with 



a pure culture of the causal organism. A infection spots; B controls. 

 (&) The same leaf photographed through an orthochromatic hght filter. 



