HARMFUL TO CROPS. 



231 



"smother fly." This is a most appropriate name, 

 for in a bad year 

 these pests literally 

 cover everything that 

 they attack. 



You must know the 

 green fly well. It has 

 long thin legs, with no 

 power of springing. 

 Its proboscis is long and thin, and made for suck- 

 ing. Some species have wings. Others have not. 



OEEEN FLY. 



These aphides suck plant juices during the 

 whole of their lives, and as they have enormous 

 powers of reproduction they are very destructive. 



They suck from stems and leaves the juices 

 which would be used by the plant to build up 

 the plant itself, and which would be used to form 

 the flower and fruit. The young bore into the 

 same part of the plant close alongside their 

 parent, and at once begin to suck up plant 

 juices ; and these in their turn begin quickly to 



