Insects and Insecticides 
15 
age lias a tendency to keep these beetles from feeding. Nos. 6-7-15 
and 27 may be used as repellants. 
The Apple Leaf-Hopper .—This is a small, active, greenish-yellow 
insect about one-sixth of an inch in length that feeds upon the leaves 
of apple and pear, and some other plants, by sucking the juices and giv¬ 
ing the leaves a mottled yellowish appearance, often causing them to 
fall prematurely. The young feed on the under side of the leaves 
mo!sitly. They do not develop wings until their last moult, but are very 
active, running in all directions if disturbed. They winter over as 
eggs deposited in the bark of the small branches. 
This insect as a rule does little damage, except occasionally to 
growing nursery stock, and sometimes it is abundant enough to dam^ 
age the foliage and speck the fruit with excrement so that it is made 
unsightly and unsalable. 
Remedies .—Must consist of contact sprays applied before the in¬ 
sects develop their wings. Spray from below to 'Sitrike the hoppers on 
the under-side of the leaves. Use Nos. 8-9-10-11-12-18-19. 
The Green Apple Aphis .—This is a small green louse that feeds 
on the under-side of the leaves of apples and sometimes the pear and 
quince, isucking the plant juices and causing the leaves to curl. It is 
usually worse during the latter part of the season. It winters over in 
PLATR 3. Fig. 2.—Young Bartlett Pear, life size, showing both young and adult of 
Howard scale. The young scales are white. 
Fig 3.—Two apple twigs showing eggs of the green apple aphis; between these twigs two 
needles of pine showing* eggs of another species of aphis that works upon the pine. Original 
in Fourteenth Annual Report, Colorado Experiment Station. 
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