67 
an eighteen-percent kerosene emulsion, add eight gallons of water 
to the stock emulsion. Soft water is to be preferred. 
The following tables will show the effects of kerosene sprays 
as applied by us in 1905 and 1906. 
Summer Spray 
Treatment 
Iveaves 
ex- 
amined 
Scales 
ex- 
amined 
Percent 
killed 
by spray 
Insecticide 
Part of 
hatching 
period 
No. of 
trees 
10 percent kerosene 
Beginning 
1 
76 
48,789 
33 
10 percent kerosene 
Middle 
1 
50 
19,425 
64 
10 percent kerosene 
End 
3 
150 
281,271 
68 
10 percent kerosene 
Middle 
and end 
1 
100 
57,179 
82 
Winter Spray 
When sprayed 
December 26 to January 5 
(once) 
January 11 to 13 (once) 
January 11 to 13 and March 30 
(twice) 
Percent 
of 
kerosene 
19 
20 
19-24 
Date of 
counting 
Feb. 1 
Feb. 1-2 
June 10 
Scales 
counted 
12,703 
23,061 
48,395 
Percent 
killed 
86 
91 
91 
