Cereals 



307 



in the soil. When serious, the formalin treatment combined 

 with crop rotation should be employed. 



Anthracnose ^-^ (Colletotrichum cereale Manns). — A serious 

 disease of cereals and other grasses, chiefly rye, wheat, oats, 

 timothy, blue-grass, red-top, and orchard grass, was dis- 

 covered by Selby and Manns in 1908. 



It is a destructive pest of very general distribution, being 

 found in all the fields examined in Ohio. In one field it is 

 estimated to have reduced the yield from 75 to 25 bushels, 

 and it is assigned as a prominent cause of shrivehng, such 



163. — Normal rye kerneLs and shriveled ones 

 due to anthracnose. After Manns. 



as is of ten ■ attributed to rust, as well as of whitening and 

 blighting of plants preceding ripening. Parts of the head 

 above the points of attack die. The portion of the head that 

 is killed is a total loss, and the general decrease in vigor of 

 the plant results in shriveled, light grains. Upon stalks and 

 leaf sheaths, beginning at the ground and extending over 

 several internodes, the acervuli may be so numerous as to 

 cause blackening. 



No remedy is known. 



Powdery-mildew, Yellow-stripe-rust and Scab. See wheat. 



Stripe-disease and Stripe-blight. See barley. 



SORGHUM, SUDAN-GRASS, KAFIR, MILO 



Blight (Bacillus sorghi Burr.). — This blight was studied 

 by Burrill in 1883 and described in 1887. It prevails upon 



