136 



AGRICULTURAL EXPERIMENT STATION. 



lice have two projections, one from each side of the hinder part of 

 the body, called nectaries or honey tubes from which a sweet fluid 

 is secreted in some quantity. Ants gather in great numbers to feed 

 upon it and will even stroke the lice with their antenna- causing ihem 

 to give out the fluid. The normal use of this fluid is probablj' to 

 feed the joung lice. 



The natural enemies of plant lice are many. Several species 

 of lady-birds prey upon them. One of these, the Fifteen-spotted 

 Lady-bird is shown in Fig. 23, where the larve (a), chrysalis (b). 



FIG. 23. 



and several forms of the perfect insect (d, e, f, g) are represented. 

 The larvae of Lace-winged or Golden-eyed Flies feed upon plant 

 lice. These flies may be known by their light green gauz}' wings 

 and offensive odor when disturbed. Their eggs are raised on 

 little stalks and are found in clusters. The larvse of Syrphus Flies 

 also devour plant lice. These flies deposit their eggs among the 

 plant lice and the blind larvas hatched from them wander about 

 devouring any lice they chance to meet. These flies may be known 

 by their black color, clear wings and j'ellow stripes crossing the body. 

 A tree afllected by plant lice can be distinguished, the twigs and 

 leaves being distorted and twisted backward. The lice find shelter 

 under the distorted leaves. Scraping the loose bark from the trunks, 

 and branches in winter and washing with soap suds will help destroy' 

 the eggs. 



THE CODLING MOTH. 



Carpocapsa pomonella^ (Linn.) 



The habits of this pest are too well known to need detailed 

 description. We give a figure which shows the perfect insect (g) 



