INSECTS INJUIITOUS TO C()R:N'. 137 



The females of this brood hxy the eggs until the middle of 

 November. This generatiou is usually carried by the ants 

 to their nests, of which they are given the freedom and in 

 which they lay their eggs. 



Bemcdics — Owing to the fact that the lice do not 

 migrate until the second generation, a rotation of crops 

 will be of considerable service in checking their injuries, 

 as corn planted on uninfested land will not be attacked 

 until it has been able to secure a good start, and if well 

 fertilized may be able to successfully withstand the injuries 

 of the lice. The proper fertilization of plants infested 

 with root-insects is always of the greatest importance, and 

 usually the corn-plant will readily throw out sufficient 

 roots to enable it to mature a crop, if the soil contains 

 sufficient nourishment and is under proper cultivation. 



As the ants not only care for the lice during spring and 

 summer, being largely responsible for their spread, but 

 house the eggs in their nests over winter, any means by 

 which the nests may be destroyed together with their 

 inmates, the adult ants, their larvae, and aphis-eggs, will 

 therefore be of considerable value in controlling the lice. 

 Deep fall plowing and harrowing, thoroughly breaking up 

 the ants' nests just before early winter, has been found to 

 accomplish this end to a large extent, and is also excellent 

 practice for destroying the hibernating larv^ of cutworms 

 and the Corn Stalk-borer. Furthermore, inasmucli as the 

 lice feed upon various weeds in early spring, if these be 

 kept cultivated out, the probability of injury to the corn 

 will be greatly lessened. These weeds are usually thickest 

 in low spots, and it is in just these places that the lice 

 appear first and do their worst damage. 



Injury done by the Corn Eoot-aphis is often overlooked 



