REPORT OF THE STATE EXTOMOLOGIST 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, S3, 85 and 106, few on trees 21 and 81, 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 good 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 

 case 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- 

 counts 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, 20f(, 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 



