SOME COTTON DISEASES IOQ 



3. That a comparatively small per cent. 



of the total weevils survive the winter 

 and emerge in the spring. 



4. That the overwintered weevil feeds upon 



the terminal bud of the young cotton 

 plants until the forms or squares de- 

 velop, then the female deposits her 

 eggs in the squares exclusively at first, 

 but later may deposit them in the bolls. 



5. That the life of the adult weevil, when 



supplied with food, is about seventy 

 days. If deprived of food it lives 

 only six or seven days except in hi- 

 bernation. 



6. For a period after emergence from winter 



quarters it is comparatively sluggish 

 and while feeding upon the cotton 

 plant may be picked or poisoned. 



7. The weevils remain in the field where 



they appear in the early spring until 

 they become very numerous. Their 

 principal period of migration is in the 

 fall. 



Based upon these life habits of the weevil Dr. 

 S. A. Knapp, Bureau Plant Industry, U. S. 



