DISEASES 199 



number of generations in one season and the injury is gen- 

 erally greatest the latter part of the season. It is esti- 

 mated that the progeny of a single pair in one season may 

 amount to 134,000,000 individuals. 



Various methods have been employed in combating this 

 pest. Reducing the number of insects in the fall by early 

 destruction of the plants has proved fairly effective. The 

 growing of early maturing varieties, early planting, use of 

 fertilizers, proper spacing of plants, and thorough cultiva- 

 tion are other means used in controlling this insect. 



Winds and flooded streams are important means of trans- 

 porting boll weevils from infected sections to uninfected 



Fig. in. Early effect of anthracnose on young cotton plants. 



areas. The pest is also disseminated by shipping seed into 

 a territory from an infested section. 



The cotton bollworm and caterpillar are difficult to keep 

 under control in some sections. Poisoning seems to give 

 fairly good results. Fall plowing is generally recommended. 



Diseases. In some sections, particularly in the humid 

 regions, the cotton plant is subject to a number of diseases, 



