Plants as Affected by Animal Parasites. 171 



try. For the destruction of these insects, special means 

 must be employed. 



301. The Chinch-Bug may be controlled in a meas- 

 ure, by burning over all grass land early in spring, in 

 seasons when attacks are expected. The bugs may be 

 kept out of com fields by plowing a furrow away from 

 the corn, on the side from which the attack is looked for, 

 and strewing stalks of fresh com in this. As the insects 

 congregate on the corn in the furrow, they should be 

 destroyed with kerosene (294). Persistent and thorough 

 work is essential to success. 



302. The Army -Worm may often be prevented from 

 migration by plowing a deep furrow, as above directed, 



and making the side toward the en- 

 dangered crop vertical, with a spade 

 or shovel. The insects 

 will congregate in the 

 I B furrow where they may 

 be destroyed by drag- 

 ging a log over them. 



303. Grasshoppers and 



Locusts may be de- 



I A stroyed, before they 



have attained their 



wings, by drawing over 



FIG. 68. Sifting box for applying ^jjg infgsted ground a 



^°^ ' "hopper-doser," which 



consists of a shallow, sheet-iron pan, with a vertical, 

 cloth-covered back. The pan contains a little kerosene, 

 and the cloth back is kept saturated with the same 



