i 4 
THE COLORADO EXPERIMENT STATION 
HOWARD’S SCALE. (Aspidiotus howardi.) 
This scale can hardly be distinguished, in external appearance, from 
the preceding species. It is the only scale that seems to be at all com¬ 
mon in Colorado orchards. The central nipple is orange red and the 
scales are often quite light colored. Its presence should be promptly re¬ 
ported to the Experiment Station. Remedies the same as for San Jose 
scale above. 
SCURVY BARK-LOUSE. 
(Chionaspis fur fur a.) 
Small white scales resem¬ 
bling scurf or dandruff on the 
trunk or branches. There are 
two sizes; the females are 
larger and oval, and the males 
are very small and slender. 
See Fig. 6. 
Remedies the same as for 
the San Tose scale. 
Fig R.—Scurvy Bark-louse; a, twig showing J 
scales of female louse; b, twig showing scales 
of male louse; c, scale of female greatly en¬ 
larged; d, scale of male greatly enlarged. 
[Howard, Yearbook, U. S. Dep of Agr., 1894.] 
WOOLLY APHIS (Schizoneura lanigera .) 
Small dark lice more or less densely covered with a white 
flocculent secretion. If the lice are crushed in the hand they leave 
a red stain. The lice attack chiefly tender bark about wounds or 
on tender growing shoots. 
Fig. 7.—Woolly Aphis, root form: a, 
small root showing swellings caused 
by the lice; b, wingless louse show¬ 
ing woolly secretion; c, winged 
louse. (After Saunders.) 
Remedies. —Early in the sea¬ 
son, when' the white patches 
begin to appear on trunk and 
branches, paint them over with 
pure kerosene (16), crude petro¬ 
leum, or a very strong kero¬ 
sene emulsion (14), or whale- 
oil soap (12) mixture. If the 
lice become abundant late in 
the season, apply kerosene 
emulsion or whale-oil soap in 
ordinary strength but with a 
great deal of force and a coarse 
spray in order to wet through 
the waxy secretion which 
covers them. 
This insect also attacks the roots. See Fig. 7. 
