INSECT PESTS AND THEIR CONTROL 977 



Mexican Cotton Boll Weevil (Anthonomus grandis, Boh.). — No pest of 

 cotton has caused so much injury as this small brown beetle. Both the 

 adult insects and the larvae feed upon the squares and the bolls, injuring 

 the fiber. 



Treatment. — Clean up and destroy all stalks, dead bolls and crop rem- 

 nants as soon as cotton is picked, either by burning or burying. Plow 

 under or burn in the fall and winter all trash in neighboring fields and 



Southern Tobacco Horn Worm (Phlegethontius sexta). 

 A — Adult. B — Larva. C — Pupa. 



hedgerows where the insect might hibernate. Prepare the land early* 

 plant early and fertilize heavily to secure an early crop. 

 Farm. Bull. 344, Senate Document No. 305, 62d Congress. 



Spring Grain Aphis (Toxoptera graminum, Rond.). — See Green Bug. 



Southern Corn Root Worm, or Bud Worm (Diabrotica duodecimpunc- 

 tata, Oliv.). — Greenish-yellow beetle marked on the back with twelve 

 black spots. Feeds on a variety of plants. Larva or grub feeds on roots 

 of corn after boring into roots and stem. 



Treatment. — No satisfactory insecticidal treatment is known. The 

 worst of the injury may be prevented in Southern states by planting about 



iBur. Ent. Cir. 123. 

 62 



