REPORT OF THE STATE ENTOMOLOGIST 1902 131 
tion was not materially changed June 12, and an examination 
Noy. 11 by my assistant, Mr Walker, showed that two were 
very badly infested, some others badly infested and a few in a 
good condition. This row of trees was in such bad condition 
at the outset, and so many of them were nearly dead or had died 
during the winter, that the actual record does not do justice to 
the insecticide. Comparative observations led us to believe that 
this tobacco whale oil soap solution was possibly a little more 
effective in destroying scale insects than the more commonly 
employed caustic potash whale oil soap no. 3. 
Linseed oil. Several trees were carefully painted with this 
substance Dec. 11, 1901, by my assistant, Mr C. M. Walker. The 
treated trees were as follows: tree 226, a small apple, and 227, 
a small peach, and 330, a very badly infested appletree, were 
painted with the boiled linseed oil. The raw linseed oil was 
similarly applied to an exceedingly badly infested appletree, 
no. 329. It was found that a small tree required about 14 pint of 
the oil, and nearly two hours were occupied in applying the 
substance. 
Mar. 10 the linseed oil could be easily seen on treated trees, 
and on May 6 it was seen that two appletrees, 329 and 330, were 
in a very serious condition and likely to die. June 12 it was found 
that 830, which was painted with the boiled linseed oil, was 
killed back to the stump and was then developing a very few 
shoots, while tree 329, which received the raw oil, was dead. 
This substance undoubtedly killed the scales and was appar- 
ently almost equally destructive to the trees. Its use in the 
fall certainly can not be advised. 
Spring applications 
The tests with various sprays in early spring were continued 
last spring, and the results of earlier years have been largely 
confirmed. 
20% mechanical crude petroleum emulsion. This mixture was 
applied Ap. 7 to about 70 trees, representing a number of the more 
common varieties. The day was cloudy, and the trees were 
damp at 11 a. m., so that no spraying was undertaken till 1 p. m., 
at which time the trees were dry, though it was not what would be 
characterized as a drying day. The buds of some varieties of 
