318 



PESTS OF ORCHARD AND SMALL FRUITS 



in the spring are dark green or red, and have honey tubes yellow 

 throughout. 



Ants are apt to be found in attendance on any of these aphids. They 

 come to secure the substance that the lice excrete, commonly called 

 " honeydew." 



Control of these insects is best achieved by prompt application 

 of a contact insecticide as soon as the lice are first seen. They are 

 readily killed by spraying with tobacco decoction, or 7 per cent kero- 

 sene emulsion, taking pains to do a thorough job. The tobacco 



extract will spread 

 more readily if soap 

 is dissolved in it. 



The Cherry Aphis 



{Mijzus cerasi Fab.) 



Injury by this plant 

 louse is usually no- 

 ticed soon after the 

 leaves have unfolded 

 in the spring. It will 

 be found clustered 

 thickly on tender 

 shoots or leaves. It 

 is a shining black 

 aphid, and if exam- 

 ined under a lens will 

 be found to have 

 long, slender honey 

 tubes. The summer 

 generations are wing- 

 less, but in the fall 

 winged individuals are produced. So far as known, this species is 

 never found on any other host than cherry. It passes the winter in 

 the egg stage. 



Fig. 489. — The Cherry Aphis. Original. 



