210 
TREES AS GOOD CITIZENS 
Twig Girdler 
(See description and remedies under Elm) 
GALL INSECTS 
Gall Aphis 
Habits Swellings which resemble 
and tumors and cause deformity 
Damage, of the twigs and leaves are 
produced by this insect when 
spring growth starts. The actual damage 
is slight, but the appearance of a tree may 
be badly marred by the galls. 
Remedy. To destroy these insects a 
spring spraying of kerosene 
emulsion should be applied at the time the 
buds are opening. This kills the insects 
and prevents the creation of the deform¬ 
ing gall growths. 
HONEY LOCUST 
White-marked Tussock Moth. Twig Girdler. 
(See description^and remedies under Elm) 
HORSE CHESTNUT 
White-marked Tussock Moth. Leopard Moth. 
Oyster-shell Scale 
(See description and remedies under Elm) 
Habits This beetle confines its 
and attacks to the Linden, in 
Damage, which respect it is different 
from other insect enemies of 
this tree, listed above. The attacks often 
cause serious injury. The borer eats the 
green bark of growing shoots, the leaf 
stems and the larger veins on the under¬ 
side of the leaves. The attack becomes 
noticeable toward the close of summer. 
Damage by boring is done by the grub, 
which eats its way under the bark and 
deep into the wood of the trunk, near the 
ground, and into exposed roots and lower 
limbs. The insect appears in May and 
begins its attack. Eggs are laid soon 
afterwards in incisions in the bark. After 
passing through transformations from 
grub to beetle, the insect leaves the tree 
through holes in the bark. The time of 
departure is throughout the summer. In 
appearance the beetles are long-horned, 
with six black spots on the back. 
The surest method of 
destroying this borer is to 
dig it out bodily, whenever this is possible. 
This is especially desirable in the case of 
a valuable tree, to make sure of the elim¬ 
ination of the enemy. Another method 
employed with good results is to kill the 
borer bodily, by probing with a wire into 
the burrow. Injection of carbon disul- 
phid is effectual when thoroughly done. 
Spraying with poisoned miscible oil solu¬ 
tion in the late summer helps in the 
destruction of the borers. When a tree is 
heavily infested and badly damaged it is 
best to cut the tree down and burn it, as 
the damage can not be overcome and the 
tree is a menace to its neighbors if it is 
allowed to stand. 
BORING INSECTS 
Twig Girdler 
(See description and remedies under Elm) 
Linden Borer 
Remedies. 
