REPORT OF THE STATE ENTOMOLOGIST 1902 131 



tion was not materially changed June 12, and an examination 

 Nov. 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 y 2 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 330, 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- 

 ent^ 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. 



20fc 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 



