58 COTTON CULTURE 



It usually attacks only the older leaves, or those which have 

 been weakened from other causes. The disease shows in 

 rounded, irregular spots on the leaf, which have a dull 

 reddish border surrounding a whitish or brownish inte- 

 rior. As the spots become old, the central portion fre- 

 quently breaks out, leaving the leaves with a perforated 

 and ragged appearance. 



Remedy. The trouble is starvation and bad soil con- 

 ditions; the remedy is obvious. Kainit is claimed to be 

 an almost perfect specific for the disease. 



COTTON-BOLL ROT 



This disease affects the boll, seed, and lint. It appears 

 to originate within the boll and is not perceptible until the 

 contents of the boll have become decayed. The disease 

 is chiefly confined to the middle and top crop. 



Remedy. The remedy, as with all diseases of this kind, 

 is liberal manuring and a rotation of crops. The disease 

 resembles Frenching in many characteristics. 



ROOT GALLS 



This is a disease caused by a nematode whichTliving in 

 the tissues, causes abnormal growth, termed "galls." The 

 injuries caused by the distortion of the roots so drain the 

 vitality of the plant that putrefaction takes place. The 

 plant becomes vitiated, and falls an easy prey to many 

 diseases. 



Remedy. Rotation of crops is effective. Kainit ap- 

 plied in liberal quantities is an aid in checking the disease. 



