92 



belonging- to Mr. K. H. H. Hampton, a half-mile east of Carter- 

 ville, and the other to Mr. A. D. McNeill, three and a quarter 

 miles northeast of the same town. The Hampton orchard was on a 

 very adhesive yellow clay, originally in jack oak {Qticrnis ohtusi- 

 /olxi), and a part of it was practically new laud. The orchard of 

 Mr. McNeill was on higher ground, and had been in cultivation 

 for many years. 



The trees chosen for the experiment were apple, cherry, pear, 

 and peach, the apple and peach predominating. Only a part of 

 them were infested by the San Jose scale, the others being sprayed 

 as a test of the effect of the insecticide on the tree. Thirty- 

 one trees were treated with pure kerosene,- -nine of them 

 apple-trees, seventeen peach, two cherry, and three pear,- and 

 twenty-one were treated with the crude oil ten of them apple, 

 seven peach, one cherry, and three pear. The trees were very 

 unequal in size, ranging from five to fifteen feet in height, and 

 from two to thirteen feet in diameter of top. They were also quite 

 unequal in condition, two of them being partially dead, two de- 

 scribed as very poor, seven as poor, sixteen as fair, and twenty-five 

 as good. But seventeen of the trees were infested with the scale; 

 eight of them apple-trees and nine peach. The degree of infesta- 

 tion varied from slight to bad, the greater part of the trees being 

 only moderately infested. 



June 15 no living scales could be found on any of these trees 

 except on three apple-trees originally badly infested, two of which 

 had been treated with kerosene and one with crude petroleum; and 

 on these, living specimens were reported as rare. No injury what- 

 ever was done by either insecticide to apple-, pear-, or cherry-trees, 

 the peach being the only kind injuriously affected. 



Of the twenty-four peach-trees, only four escaped all injury. 

 Three of these had been sprayed with kerosene and one with crude 

 petroleum. Five of the twenty-four trees were dead by June 15, 

 (two, however, having been partly dead in the beginning); nine 

 suffered a slight or temporary injury; and the tops of six were 

 badly damaged, mainly by the killing of the terminal twigs. 

 Eleven of these twenty-four peach-trees were only two years old 

 and none of these 3^oungs trees were injured permanently or 

 seriously. Those reported damaged at the first inspection, April 

 29, had fully recovered and thrown out a vigorous growth of 

 young wood by the 15th of June, with the exception of a single 

 tree which still showed injury to the upper terminal twigs. 

 Several of the older trees, on the other hand, which appeared un- 

 injured April 29, were found badly damaged on the second visit. 



