456 Report oF THE HorTICULTURIST OF THE 
The beetle feeds on the plum leaves and for this reason spraying 
the trees with Paris green or London purple has been advocated. 
No doubt the insects may be killed to some extent in this way but 
the foliage of stone fruit trees is particularly liable to injury from 
Paris green or London purple so that these poisons must be used 
sparingly and much diluted. When the insect is abundant the 
jaring is undoubtedly the best way of controlling the pest. 
GREEN FRUIT-WORMS. 
The green fruit worms sometimes are so abundant on the plum 
as to cause much damage. The treatment recommended is given 
on page 413. 
PLANT LICE. 
Several species of plant lice attack the plum. They collect in 
great numbers on the under sides of the leaves, causing them to 
curl and finally drop off. The infested trees should be sprayed 
with whale-oil soap, one pound to seven gallons of water, as soon 
as the lice appear. The spraying should be directed from the 
under side so as to reach all of the lice. 
QUINCE DISEASES 
CANKER OF TREE. - BLACK ROT OF FRUIT. 
The canker of the tree and black rot of the fruit of the quince 
are caused by the fungus which causes similar trouble with the 
apple and pear. For a discussion of the disease and remedial 
measures see page 399. 
BLIGHT. (FIRE BLIGHT.) 
This disease is caused by the same parasite which produces the 
fire blight of the pear. It is discussed on page 448. 
LEAF BLIGHT AND FRUIT SPOT. 
(Entomosporitum maculatum Lev.) 
Description.— Fruit spot and leaf blight of the quince are 
caused by the same fungus that causes pear leaf blight. When a 
