REPORT OF THE STATE ENTOMOLOGIST 1901 767 
individuals with a spray when the bark offers numerous shelter- 
ing crevices. 
Aug. 9 there were few or no young scale insects on trees 38, 
40, 83, 85 and 196, few on trees 21 and 84, and rather few on tree 
66. 
Sep. 25, the following conditions prevailed. There were very 
few or no living scale insects on trees 83 and 106, very few on 
trees 84 and 85, few on trees 38 and 40. Young scale insects 
were rather abundant on some twigs of tree 21, but its general 
condition was very goed considering its previous history. 
This record is apparently not so satisfactory as in the case of 
the smaller per cent of oil. Allowance should be made in the 
ease of trees 21, 38 and 40. The first was in exceedingly bad 
shape in the spring of 1900, and, while spraying with undiluted 
kerosene killed many of the scales, so many were left that the 
tree was abundantly infested the following September. The 
scraggy, rough condition of the tree, in my opinion, amply ac- 
eounts for the failure to kill all the scale insects last spring. 
Trees 38 and 40 were sprayed with 20% kerosene in 1900, and the 
abundant scales on them in the spring of 1901, together with the 
very rough bark of tree 38, would afford ample shelters for the 
escape of a few. The very few living scales found on trees 84 
and 85 in September 1901 could easily have been brought from 
adjacent trees, though one or two individuals may have escaped 
the spray. 
Titusville oil, 20% mechanical emulsion. There were 14 trees 
treated with this mixture. They are as follows: trees 26 and 
27, Kieffer; trees 28 and 114, seckel; tree 72, Flemish beauty; 
tree 73, Howell; tree 74, beurre bosc; trees 112 and 113, beurre 
d’Anjou pears; trees 45, 47, 90 and 91, old Mixon peach; and 
tree 46 a champion quince. Their condition near the end of 
the growing season, Sep. 7, 1900, was as follows. There were few 
or no young scale insects on trees 26, 27, 112, 113, few on trees 
45, 46, 74 and 114; they were rather abundant on trees 47 and 
73, abundant on tree 28, and very abundant on trees 90 and 91. 
_ The first examination after spraying occurred May 22, and 
only those trees presenting something out of the ordinary were. 
