222 MANUAL OF VEGETABLE-GARDEN INSECTS 



References 



Forbes, 14th Kept. State Ent. 111., pp. 23-33. 1885. 



Forbes, ISth Rept. State Ent. 111., pp. 58-85. 1894. 



111. Agr. Exp. Sta. Bull. 44, pp. 237-256. 1896. 



111. Agr. Exp. Sta. Bull. 104, pp. 102-123. 1905. 



111. Agr. Exp. Sta. Bull. 130. 1908. 



111. Agr. Exp. Sta. Bull. 131. 1908. 



U. S. Bur. Ent. Tech. Bull. 12, pp. 123-144. 1909. Bihliogravhy. 



U. S. Bur. Ent. Bull. 85, pp. 97-118. 1910. 



111. Agr. Exp. Sta. Circ. Jan. 9, 1913. 



The Southern Corn Root- Worm 



Diahrolica duodccim punctata Fabricius 



The southern corn root-worm is also known as the twelve- 

 spotted cucumber beetle and in the South as the corn bud-worm 



from the habit of the larvae of kill- 

 ing the bud or central leaves of 

 the young corn plant. The beetle 

 is generally distributed through- 

 out the United States and southern 

 Canada east of the Rocky Moun- 

 tains southward to Florida and 

 Mexico. It is injurious to corn 

 from southern Illinois to Virginia 

 and southward. 



The beetle (Fig. 139) is about 

 i inch in length, with the head 

 black and the thorax and wing- 

 covers yellowish green. Each 

 wing-cover is marked with six 

 black spots arranged in three transverse rows. The antennae 

 and legs are black; the first three joints of the antennae and 

 basal half of the femora are pale. The beetles hibernate 

 under any convenient shelter, often in alfalfa fields. In the 



Fig. 139. — The southern corn 

 root-worm beetle ( X 5) . 



