12 
Bulletin 71. 
eighth of an inch long, curved and small at one end. Very easily 
overlooked. See Fig. 7. 
Remedies the same as for the San Jose scale. 
Fig. 7.—Oyster-shell Bark-louse: a, female scale from below, showing eggs 
greatly enlarged; 6, the same from above; c, female scale on twig, natural 
size; d, male scale enlarged. [Howard, Yearbook, U. S. Dep. of Agr., 1894.] 
woolly plant-louse. ( 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. 
Remedies .—Early in the sea¬ 
son, when the white patches begin 
to appear on trunk and branches, 
paint them over with pure kero¬ 
sene (16), crude petroleum, or a 
very strong kerosene emulsion (14), 
or whale-oil soap (12) mixture. If 
the lice become abundant late in 
the season, apply kerosene emul¬ 
sion or whale-oil soap in ordinary 
strengths 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. 8. 
Fig. 8. —Woolly Aphis, root form : a, small root 
showing swellings caused by the lice; 6, wing¬ 
less louse showing woolly secretion ; c, winged 
louse. (After Saunders.) 
