200 COTTON 



some of which do considerable damage. The following are 

 the most important : cotton wilt, root knot, anthracnose 

 or boll knot, root rot, and rust. 



Diseases of cotton are controlled to a large extent by 

 breeding of resistant varieties, rotation of crops, selection 

 of clean, early varieties of seed, and proper cultivation. 



EXERCISES 



1. Outline a four-year rotation suitable for a cotton farm. 



2. Which cotton fields are more likely to be seriously affected 

 by the boll weevil, those on which cotton is grown in rotation 

 once in three years, or those growing cotton every year ? Why ? 



HOME PROJECTS 



1. By actual trial determine the cost of producing and har- 

 vesting an acre of cotton. 



2. Compare the yield of upland and Sea Island cotton by 

 growing and harvesting equal areas of each, side by side, under 

 the same conditions, keeping accurate records of all processes. 



