S. G. Paine and W. F. Bewley 187 



SYMPTOMS OF THE DISEASE. 



The stem of an attacked plant shows the earliest symptoms of disease 

 as light or dark brown to black sunken patches of irregular shape, 

 varying from small spots to long furrows and "blazes"; the blazes are 

 often three or more inches long and frequently extend over the entire 

 length of an internode. They are well shown in the photograph, Plate IX, 

 fig. 1. In slight cases these markings occur intermittently along the 

 stem while in bad cases the typical furrows can be'found throughout the 

 whole length of the stem and on the leaf and truss stalks. The name 

 "Stripe" aptly describes this distinctive feature of the disease, but it 



#f<r^.<^ 



Fig. 2. Showing ripe fruits of tomato infected with "Stripe Disease." 



should not be confused with the "Black Stripe" supposed to be due to 

 Macrosporium solani^. 



On the leaf the disease first appears as yellow blotches near the 

 mid-rib and the main veins. These later turn brown and extend so that 

 finally the greater part of the surface becomes browned and much dis- 

 torted by the shrivelling of the diseased areas. 



The fruits show light or dark brown sunken patches with round or 

 irregular outline well shown in Figure 2, Plate VIII and Plate IX, figs. 4 



^ There is however considerable doubt whether this is a distinct disease. It seems 

 highly probable that Macrosporium solani exists as a saprophyte upon the tissue destroyed 

 by the "Stripe" bacillus. This is emphasised by the fact that W. Dyke (quoted by "W" 

 in Gard. Chron. 51, p. 52, 1912) thought that this fungus was the cause of Streak Disease 

 of Sweet Peas, a disease now known to be due to a bacillus. 



1.3—2 



