ORCHARD PLANT LICE AND THEIR REMEDIES 
13 
by its black color when fully grown, whether winged or wingless. The im¬ 
mature lice are of a yellow or amber color. In all stages, and especially 
in the spring, this louse will be found upon the bark of the small limbs 
-where it continues to feed after the leaves appear. Many of the lice will 
go upon the leaves also causing them to curl. 
Like the preceding species, this louse also disappears by the middle of 
July or the first of August without an3’’thing being done for it, but it does 
not go to any other plants so far as known, but is said to descend to the 
roots of the peach where it remains until the following spring. So far as 
known this species does not lay eggs but lives over winter as a louse. 
This insect is continually being shipped into Colorado upon the roots 
of nursery stock. Our Horticultural law and the vigilence of our county 
horticultural inspectors has done much to keep it out of the orchards, but it 
is impossible, under present methods, to prevent an occasional tree, infested 
with this louse, being planted. 
re:me:die:s 
All peach trees, before being planted, should be thoroughly fumigated, 
or dipped or sprayed with Black Leaf, a home-made tobacco decoction, or a 
good kerosene emulsion. 
The remedies in the orchard are the same as for the Green Peach 
Aphis mentioned above. 
PLUM PLANT LICE. 
THE MEALY PLUM LOUSE. [Hyalopterus ariindinis Pah.) 
A light green louse with a rather long narrow body that is covered with 
a fine white powder. The lice occur upon the under side of the leaves, 
which they may completely cover by the middle of June, but the leaves do 
not curl. By the first week in July, many of the lice are winged, and by 
the last of that month the lice will nearly all have left the plum. The lice 
go to certain grasses, especially the large coarse Reed-grass growing in wet 
places. In the fall winged migrants return to the plum where, later, the 
eggs are deposited by egg-laying females and the lice all die. The next 
spring the eggs hatch to continue the species. 
RE^MEDIKS 
Spray as for the green peach aphis but use a heavy pressure and direct 
all of the spray upon the under side of the leaves where all the lice are. 
These lice are killed with difficulty on account of the powdery covering upon 
their bodies. 
THE RUSTY PLUM LOUSE. (Aphis setariae Thos.) 
This louse is readily distinguished from all others upon the plum by 
its dark brown body color, and with a hand lens one can usually see the con- 
cpicuous white legs, antennae and tail. This louse seems to have a pre¬ 
ference for the tender bark near the tips of rapidly growing shoots although 
it covers the undersides of the leaves also. At a little distance the louse 
may almost appear black to the naked eye. This louse spends the entire 
