766 NEW YORK STATE MUSEUM 



Sep. 25, there were very few or no young scale insects on tree& 

 24, 25, 71, 88, 89, 110 and 111; and young were relatively few on 

 trees 70 and 115. 



The above record, it will be observed, shows that with only 

 one application in a year, the San Jose' scale was kept in control 

 in a very satisfactory manner, with the exception, perhaps, of 

 trees 70 and 115. The former was very badly infested in the 

 spring of 1900, and, while the treatment with whale oil soap con- 

 trolled the pest to a great extent, living young were very abun- 

 dant on it in September 1900. Its bark was very rough, and this 

 with the old scales would serve as a considerable protection to 

 the young, and it is not surprising that some survived the spray- 

 ing of 1901. It is by far the worst tree in this lot. Tree 115 is- 

 exceptional in that it was located on the edge of an old orchard,, 

 where it could become infested from neighboring trees. 



Standard oil, 25f c mechanical emulsion. 7 trees were treated 

 with this mixture. They are as follows: tree 21, a Howell, and 

 tree 106, a Vermont beauty pear; trees 38, 83 and 84, globe peach;, 

 tree 40, a Crawford and tree 85, an old Mixon peach. The con- 

 dition of these trees toward the close of the growing season, Sep. 

 7, 1900, was as follows. Young scale insects were very few on 

 trees 83 and 84, few on trees 85 and 106, abundant on tree 21, 

 very abundant on tree 38, and exceedingly so on tree 40. Trees 

 39, 66, 67 and 107 also belonged* in the area treated with this 

 mixture, but all of them were cut back to mere stumps in 1900, 

 and they were removed in the spring of 1901. 



May 22 the following notes were made on trees presenting an 

 appearance out of the ordinary. There were only a few small 

 limbs alive on tree 40', and a number of small limbs had been 

 winterkilled on tree 83. Tree 106 was thickly set with fruit. 



July 3, the following conditions were apparent. There were 

 very few or no young scale insects on trees 38, 40, 83, 84 and 106; 

 they were few on tree 21, and rather abundant on tree 85. It 

 was noted that the bark was quite rough on trees 21 and 66,. 

 which undoubtedly explains why young scale insects were pres- 

 ent on these trees, as it is practically impossible to kill all the 



