Insect Enemies. 107 



sap, and descended to the callus as that grew, where 

 they developed into the forms revealed by the micro- 

 scope? Evidently there is still opportunity, as well as 

 a great call, for the further study of this much to be 

 dreaded pest. 



Green fly is the name by which the most common of 

 all insects is famililarly known, but Prof. Baker denom- 

 inates it " The Rose Plant Louse." Its method of attack 

 is like that of the spider, puncturing the plant and ab- 

 sorbing its juices. Although not as dangerous an ene- 

 my of the rose as many already described, because it can 

 more easily be kept at bay, still from September to May 

 it will be found ever present if measures are not taken 

 to prevent it. Its power of reproduction almost passes 

 belief. 



Prof. Baker tells us, " one single louse might have in 

 one summer six thousand million descendants." The 

 danger to be apprehended from them is from neglect. 

 If this occurs for a short time, even a few days, some 

 of them will have attained a size and strength which 

 makes it difficult to kill them, while in number, the 

 smaller ones will'be legion. 



There is no excuse whatever for the person who allows 

 them to attain any size, or even to be seen. It is sim- 

 ple neglect on the part of the one in charge, where this 

 state of things exists, as there are many devices for 

 their prevention. 



