210 TREES AS GOOD CITIZENS 



Twig Girdler 



(See description and remedies under Elm) 



GALL INSECTS 

 Gall Aphis 



Habits Swellings which resemble Remedy. To destroy these insects a 



and tumors and cause deformity spring spraying of kerosene 



Damage, of the twigs and leaves are emulsion should be applied at the time the 



produced by this insect when buds are opening. This kills the insects 



spring growth starts. The actual damage and prevents the creation of the deform- 



is slight, but the appearance of a tree may ing gall growths, 

 be badly marred by the galls. 



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) 



BORING INSECTS 



Twig Girdler 



(See description and remedies under Elm) 



Linden Borer 



Habits This beetle confines its Remedies. The surest method of 



and attacks to the Linden, in destroying this borer is to 



Damage, which respect it is different dig it out bodily, whenever this is possible. 



from other insect enemies of This is especially desirable in the case of 



this tree, listed above. The attacks often a valuable tree, to make sure of the elim- 



cause serious injury. The borer eats the ination of the enemy. Another method 



green bark of growing shoots, the leaf employed with good results is to kill the 



stems and the larger veins on the under- borer bodily, by probing with a wire into 



side of the leaves. The attack becomes the burrow. Injection of carbon disul- 



noticeable toward the close of summer. phid is effectual when thoroughly done. 



Damage by boring is done by the grub, Spraying with poisoned miscible oil solu- 



which eats its way under the bark and tion in the late summer helps in the 



deep into the wood of the trunk, near the destruction of the borers. When a tree is 



ground, and into exposed roots and lower heavily infested and badly damaged it is 



limbs. The insect appears in May and best to cut the tree down and burn it, as 



begins its attack. Eggs are laid soon the damage can not be overcome and the 



afterwards in incisions in the bark. After tree is a menace to its neighbors if it is 



passing through transformations from allowed to stand, 

 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. 



