550 THE FUNGI WHICH CAUSE PLANT DISEASE 



100-200 X 4 /I, browTiish; conidia falcate, 25 x 4 n; conidiophores 

 ovoid, 20 X 8 ii., hyaline to fuscous. 



This is believed to be the chief cause of the red rot of sugar- 

 cane."* It was reported in" the United States by Edgerton,"^ 

 also by Stevens.™ Inoculation experiments indicate that it is 

 distinct from C. lineola, on sorghum and Johnson grass, which it 

 resembles morphologically. 



C. cereale Manns."^ 



Spots circular to ovoid, 30 mm.; acervuli dark brown, or black; 

 setae few or many, dark brown to black, at base 6-8 n thick, 

 tapering to a length of 60-120 n, continuous or 1 to 2-septate; 



Fig. 371 . — C. cereale, acervulus showing mycelium, setse, oonid- 

 iospores and spores. After Manns. 



conidia 18-26 x 3-4 n, spindle to boat-shaped, 2 to several- 

 guttulate; conidiophores, very short, 12-6 x 1-2 fi. 



This fimgus is parasitic on the roots, stems, blades and spikes 

 of rye, wheat, oats, barley, emmer, orchard grass, timothy, blue 

 grass and chess. The disease causes a premature ripening and 

 shrivelling of the grain. Superficially the diseased heads present 

 the same appearance as those attached by scab (Fusariose) but 

 no pink over-growth is present, nor is the presence of the disease 

 always apparent, as it was found on numerous heads of grain which 

 appeared to be healthy. Morphological studies indicate that all 

 the hosts mentioned above are affected by the same fungus. This 

 was confirmed by cross inoculations in the case of wheat and 

 emmer. 



