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 
(Myzus 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. 
Fic. 489.— The Cherry Aphis. Original. 
