236 



CORN 



attacked. This commonly occurs below the opening at which it en- 

 tered. The moth is rather mouse colored and flies by night. 



Prevention and Remedy. AVhen a corn plant is attacked by a 

 stalk borer, there is no remedy that can be applied that will success- 

 fully combat the intruder without doing injury to the plant itself. 

 The place of eradication is where the larvae first appear, namely, in 

 grassy places. Here they may be discovered by the tops of the grass 

 attacked turning whitish in color and dying. This grass should be 

 mowed immediately and burned or fed to stock. It is generally the 

 outer borders of the corn fields that are injured by the stalk borer. 

 The damage done to the corn fields is limited. Whole fields are not 

 attacked by the stalk borer as in the case of the other corn pests, al- 

 though it is known to have destroyed 15 acres at Elmira, Illinois in 

 a single season. In Greene County, Iowa, in 1908, a 3 acre pier? 

 of corn was ruined by the ravages of this worm. 



Stalk-borer (llydroccia nitela) a, adult; b, half-grown 

 larva; c, mature larva in burrow; d, side of one of its 

 segments; b, pupa. All slightly enlarged. 



THE NORTHERN CORN ROOT WORM.'!= This little larva, or 

 worm, is about two-fifths of an inch long, and approaches a pin in 

 thickness. It is white, with the exception of its head, the top of the 

 first segment, and a spot on the last segment, which are of a brown- 

 ish color. 



,y E. p. 



*ThiB investigation carried 



Bn\lJT9ftB. 



Humbert under the personal supervision of M. Ij, 



