New York AaricutturaL Exprrtment Strarion. 449 
twigs. Where the nymphs are numerous they take so much 
nourishment from the trees that the new growth is seriously 
checked. The whole tree assumes a stunted, unhealthy appear- 
ance. As a natural result the fruit crop is greatly lessened and, 
in some instances, trees have been killed. The first brood in the 
spring probably does the most direct injury. A favorite place 
for the young nymphs is in the axils of the leaves and at the 
base of the fruit stems. Within two or three days after hatching 
they cover themselves with honey dew which finally becomes so 
abundant as to disfigure the leaves and fruits, the amount of in- 
jury done in this way varying of course with the number of 
nymphs. , 
Treatment.— The young nymphs are most easily reached. 
Close watch for them should be kept when the leaves are unfold- 
ing in the spring. As soon as the nymphs are found spray the 
trees thoroughly with kerosene emulsion diluted with about ten 
parts of water** or with a solution of whale-oil soap, one pound to 
from five to seven gallons of water. Two applications about ten 
days apart will probably be necessary. It is important to begin 
the work before the nymphs have covered themselves with honey 
dew as it is then much more difficult to reach them with a spray. 
SAN JOSE SCALE. 
(Aspidiotus perniciosus Comst. ) 
Description.”— This inseet may be briefly described as a small, 
nearly circular, ash-gray scale with a prominent dark nipple at 
the center. These are the female scales. They are always 
greatly in excess of the males and are chiefly responsible for the 
injury which is done. The San Jose scale attacks the bark, leaves 
and fruit. Jn common with certain other scale insects it causes a 
44Some growers use a much stronger emulsion than this with apparently 
no injury to the trees. 
45 This insect is discussed more in detail in Bulletin 136 of this Station, 
pages 587-593, by V. H. Lowe. 
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