69 



ha ma lying south of a line drawn westward from Lee 

 County to Sumter County. It is also found in small 

 widely distributed areas in other counties. 



The numerous dots on the mi.p indicate that portion of the 

 State where cotton wilt is severest. 



METHODS OF CONTROLLING COTTON WILT AND 



ROOT-KNOT. 



Wilt-Resistant Varieties of Cotton. 



Wherever cotton wilt occurs, nematodes, which cause 

 root-knot, are usually found. These worms enter the 

 cotton roots, and cause abnormal growths, thus mak- 

 irig it easy for wilt to gain an entrance into the cotton 

 roots. 



Most varieties of cowpeas, such as Whippoorwill, 

 New Era, Red Ripper, and Clay are susceptible to root- 

 knot, and when they are grown on infested land, the 

 number of nematode worms or gall worms increases. 

 Sweet potatoes, sugar cane, and many garden vege- 



