i8 



the bolls and about fifteen per cent of the seeds were infested. 

 If a field is badlv infested, three or four worms niav be found 



Fig. 9. — Cotton boll showing egg of the bollworm in situ. 

 (Photograph by author.) 



in one boll, practically destroying the boll as far as its lint 

 is concerned. 



:> .: Life history. There are four dis- 



tinct stages in the life cycle of the 

 bollworm, as in the case of all butter- 

 flies and moths — namely, the egg, 

 larva, pupa, and adult. 



The egg. The eggs of the boll- 

 worm are deposited singly on the 

 leaves, bracteoles and bolls. They 

 are quite small (about one-fortieth 

 of an inch in longest diameter), flat- 

 tish and pearly white. They are 

 small enough to be quite inconspicu- 

 ous and are detected only with the 

 closest scrutiny. The peculiar sculp- 



Fig. 10. — Egg of the bollworm, • ^ « , . , 



greatly enlarged. (Original) turm S ° f the egg-SUrfaCC which ren- 



