21 V2 



SCHOOL ENTOMOLOGY 



concentrate, then as soon as the piles are dry enough to burn, 

 cut the remaining rows and burn at once. In this way the 

 great bulk of the adult weevils and all of the immature 

 states in the squares and bolls are destroyed The few es- 

 caping weevils will be starved out before the weather becomes 

 cold enough for them to hibernate, or will be so weakened as 



FIG. 185. Cross-section 

 of cotton square show- 

 ing egg and opening 

 through which it was 

 laid greatly enlarged. 



FIG. 186. Cotton squares broken open, 

 showing the boll weevil larva? within 

 enlarged. 



to die in hibernation. Thus it has been shown by Professor 

 Wilmon Newell, in Louisiana, that where the weevils were 

 forced into hibernation on October 15th only 3 per cent sur- 

 vived the winter, but that when the destruction of the stalks 

 was put off until after December 15th, 43 per cent survived, 

 with proportional numbers at intervening dates. Further- 



