214 INSECTS 
The eggs of this little pest are laid about the roots of these 
plants. The larve, which are slender, white grubs with 
brownish heads, feed upon the roots and the underground 
part of the stems. There are two or three generations 
during the season. The insect hibernates in the pupa 
stage. 
Plant Lice are among the commonest and most harmful 
insect pests. They occur in dense colonies on almost every 
kind of plant, from the tenderest 
annuals to large trees, and are 
often very destructive, sucking 
the sap from the foliage and 
tender stems and thus weaken- 
ing the plant. Some species 
even attack the roots. They 
are very tiny creatures and there 
are many kinds. Some are 
green and others are dark-col- 
ored. Some of them cause the 
leaves to curl up and form an 
inclosure in which they live. 
There is one species that attacks 
the cottonwood and forms for 
itself a peculiar house on the 
twisted leafstalk. 
Many kinds of plant lice produce a sweetish fluid called 
honey-dew. This may often be seen on the leaves, and 
harms their appearance and attracts ants that feed upon it. 
The remedy for plant lice is to spray them with some prepa- 
ration that kills by coming in contact with the body. House 
plants that can be properly inclosed for the purpose may 
be fumigated with tobacco smoke. 
CoLtony oF PLantT LICE 
On the plum. 
