Cereals 



289 



Any method of reducing the 

 amount of infective trash, par- 

 ticularly old stalks near or in the 

 fields, aids in control of this pest. 

 Practically, this means to take 

 out of the field and destroy all 

 rot-infected ears and to cut in- 

 fected stalks low and haul them 

 away or burn them. It is still 

 better to practice such rotation 

 that corn will not follow corn 

 within two years. 



Dry-rot (Fusarium sps). — 

 Upon the ears this disease ap- 

 pears as a dense, felted, white 

 mycelium, extending between 

 the kernels to the cob. The 

 kernels are killed and their 

 starch partly consumed. 



A second Fusarium 

 characterized by a deep 

 to red color noted on the ear 

 when the husks are removed. 

 The kernels are brittle and 

 the starchy portion within is 

 powdery. 



A third Fusarium disease 

 causes less complete destruction 

 of the ear than the preceding; 

 often only a few scattered ker- 

 nels are affected. The mycelium 

 is white and sparse. A cob- 

 rot ^^^ due to Coniosporium 

 softens the cob without mate- 

 rially injuring the grain. 



Root-rot, stalk-rot ^i"^- 504. 506, 528 

 first record of root and stalk-rots of 



IS 



pink 



Fig. 152. — Corn mold caused 

 by Fusarium. After Burrill 

 and Barrett. 



(Fusarium sps.). — The 

 corn was made in 1907 by 



