Insects and Insecticides. 
13 
ATTACKING THE ROOTS. 
woolly plant-louse. ( Schizoneura, lanigera.) 
This insect attacks the roots as well as the trunk and brancnes. 
It causes warty excrescences and often the destruction of the greater 
portion of the smaller roots (Fig. 8). The description of the louse 
is the same as for the trunk form mentioned above. 
Remedies .—Remove the earth about the crown for a distance of about two 
feet, put in four to six pounds of tobacco dust (or double this amount of stems) 
and cover again; then irrigate. If tobacco can not be procured, use kerosene 
emulsion (14) or whale-oil soap (12) of the ordinary strengths in its place, pouring 
in a liberal quantity. 
INSECTS ATTACKING THE PEAR. 
Any of the insects mentioned above as attacking the apple may 
be found attacking the pear, except the woolly plant-louse, and the 
same remedies should be employed. 
pear-tree slug. ( Eriocampa cerasi ) 
Slimy dark-colored larvae 
with the head end much the 
larger, somewhat resembling 
snails, resting upon the upper 
surface of the leaves, which 
they skeletonize. See Fig. 9. 
Remedies. — Apply white 
hellebore, or any of the arsenical 
mixtures (3-8), by dusting or 
by spraying. Freshly slaked lime 
(20) or wood ashes (32) freely 
dusted upon the larvae will kill 
many of them. 
This is an easy insect to 
control and should not be 
allowed to continue the seri¬ 
ous injuries to the pear, plum 
and cherry in this State that 
it has been doing the past 
few years. 
Fig. 9. —Pear-tree Slug: a, adult fly; b, larva or 
slug with the slimy covering removed; c, same 
as preceding in natural condition; d, leaves 
showing slugs and their injuries. (Marlatt, Cir¬ 
cular 2t5, Second Series, U. S. Dep. of Agr., Div. 
Entomology. 
PEAR LEAF-BLISTER. (PJiytoptUS pyH.) 
Small dark spots upon the-leaves, sometimes very abundant 
and involving the greater portion of the surface. The diseased 
portion is thickened also and at first is green like the rest of the 
leaf. The leaves often fall prematurely. 
