INSECTS AND DISEASES 313 



exterminate them by filling the air surrounding 

 them with poisonous fumes. 



The following table lists the insects most 

 commonly met with and prescribes the poison 

 for each, giving at the same time the names of 

 the plants most frequently attacked.* 



Ants — Usually harmful only on the lawn. 

 Pour a teaspoonful of bisulphate of carbon in 

 the holes and immediately cover or plug. 



Aphis — Plant-lice, pale or dark green, brown 

 or black, found on stems and leaves all sea- 

 son outdoors and on indoor plants all winter. 

 Spray with whale-oil soap or fumigate with to- 

 bacco. 



Borer — Many trees in addition to the maple 

 are attacked by borers. The round-headed 

 apple borer and the flat-headed borer attack 

 the apple and the thorn ; the peach borer attacks 

 the plum, peach and cherry, and other trees, 

 such as the poplar, willow, linden, locust, etc. 

 Apply the same treatment as that prescribed 

 for the maple-borer. 



Black Lice — See Aphis. 



* The author is indebted for much of the matter on this sub- 

 ject to the various bulletins issued by the Department of Agri- 

 culture and especially to Benjamin W. Douglass, State Ento- 

 mologist of Indiana, not only for assistance frequently ren- 

 dered, but for many photographs as well. 



