INSECT PESTS OF GARDEN AND FIELD 211 
used for this purpose act as a poison, and others are oily 
and soapy mixtures that stop up the breathing pores of the 
insects and smother them. Kerosene emulsion is one of 
the commonest remedies of this class and is made of soap 
suds and kerosene. Tobacco, another remedy, is used 
either by smoking the infested plants with it or by steeping 
it in water and using the liquid as a spray. 
There are many other preparations sold by dealers, but 
each serves either to poison the food or to kill the insects 
by coming in contact with them. 
The Colorado Potato Beetle. — This is often popularly 
called the “‘ potato bug,’”’ but the hard wing covers of the 
Tue Cotorapo PoTATO BEETLE AND ITS DEVELOPMENT 
a, eggs; 6, larve; c, pupa (underground) ; d, adult; e, wing cover; f, leg. 
adult easily show us that it is a typical beetle. The adults 
are about half an inch in length, of a yellowish color, with 
ten black marks on the wing covers. These insects pass the 
winter as adults underground, and it would be easy to con- 
