210 



INSECTS AFFECTING INDIAN CORN. 



tiny beaks, and multiply viviparously or by giving 

 birth to living young. They continue developing in 

 this way until fall, when the egg-laying brood is 

 produced. 



The presence of these lice upon the roots can easily 

 be determined by carefully pulling or digging up 

 plants supposed to be injured. The aphides, if pres- 

 ent, will be seen crowding the roots as small, bluish- 

 green particles. The affected plants generally appear 

 yellow and sickly, growing slo'wly or not at all. 



Remedies. — A judicious rotation of corn with 

 other crops is the only practicable preventive meas- 

 ure that has as yet been suggested. 



The Western Corn Root- worm. 



Diabrot ic< i lo ng icornis. 

 In Illinois, Kansas, and other western States, the 

 roots of corn are frequently eaten off, during June 



Fig. 111. Corn Root-worm : a, egg; b, small section of egg, greatly mag 

 nified; c, larva; d, pupa; e, beetle. Magnified. 



and July, by a slender, white worm, a little less than 

 half an inch long, and about as thick as a common 



