246 DISEASES OF FIELD & GARDEN CROPS. [CH. 



many other fungoid ailments the fungus appears to 

 excite an abnormal growth of chlorophyll, and the 

 spikes of affected plants are commonly greener than the 

 sound ones. Even on examining the ears it sometimes 

 happens that but little seems amiss ; it is not until the 

 glumes and pales are pushed aside that the dark diseased 

 seeds . become visible. Sometimes the bunted grains 

 burst whilst still in the ear, and the escaped spores stain 

 the glumes and pales a dark colour. Practised eyes 

 readily detect these slight black stains. 



A bunted grain of wheat is illustrated at Fig. 114, A, 



B 



X-5 



FIG. 114. BUNT OF WHEAT. 



Grains of wheat destroyed by Tilletia Caries, Tul. 



Enlarged 5 diameters. 



with a transverse section at B, and a longitudinal section 

 at C, enlarged five diameters. Reference may be made 

 to Fig. 42 for a normal grain of wheat, and to Fig. 45 

 for an example of ear-cockle, all engraved to the same 

 scale. The external appearance of bunted grains of wheat 

 is different from healthy grains. Bunted wheat seeds are 

 shorter and wider than healthy ones ; they are dwarfed 

 in height and distended in width, and generally somewhat 

 pointed towards the base. Instead of being pale buff in 

 colour, they are of a somewhat dark, dull green tint. 

 They are frequently cracked, as shown at A, and from 



