392 



SOUTHERN FIELD CROPS 



Such corn may be cut and fed to live-stock when in the 

 late roasting-ear condition ; or it may be left in the field as 



usual. In this 

 latter case corn 

 is still help- 

 ful in reduc- 

 ing the num- 

 ber of b o 1 1- 



worms 



since 



it attracts a 

 number of 

 worms to each 

 ear. Here they 

 devour each 

 other, leaving 

 only one or two 

 alive, instead 

 of many. 



Plowing in 

 late fall or 

 early winter 



destroys the burrows (Fig. 170) in which the insect passes 

 the winter, and turns the pupae up to be killed by unfavor- 

 able weather. 



THE MEXICAN COTTON BOLL-WEEVIL. ANTHONOMUS 

 GRANDIS 



361. Extent of injury. The boll- weevil is the most 

 destructive insect enemy that has ever attacked cotton 

 in the United States. When it first invades a new region 

 it sometimes reduces the total production of cotton by 



FIG. 170. PUPA OF BOLL-WORM IN ITS UNDER- 

 GROUND BURROW. 



