256 SCHOOL ENTOMOLOGY 



late fall or during the winter, and to harrow thoroughly. 

 This breaks up the pupal cells, crushing some, and exposing 

 others to the elements. Field corn which is planted early 

 is much less injured than that planted later. Where the 

 caterpillars of the first generation are noticed in the axils of 

 the young corn, they may be destroyed by sprinkling pow- 

 dered arsenate of lead in the axil. The same method should 



FIG. 180, Bollworm boring into green tomato. (After Quaintance 

 and Brues, U. S. Dept. Agr.) 



be used for destroying the worms in tobacco buds. Thor- 

 ough spraying with arsenate of lead will prevent injury to 

 tomatoes. As with corn, cotton planted early and quickly 

 matured is but little injured. Dusting cotton foliage with 

 powdered arsenate of lead will destroy the young caterpillars 

 where they are sufficiently abundant to warrant. As the 

 moths prefer to lay their eggs on corn silk, cotton may be 

 protected by the use of strips of late corn planted through 

 the fields so as to act as a trap crop. About June first plant 



