152 NEW YORK STATE MUSEUM 



representing a number of the more common varieties. It will be 

 observed that the spraying was earlier than usual, and the weather 

 conditions favorable, the day being dry with only a moderate 

 amount of wind. This insecticide was applied as in the spring 

 of 1902, to the following trees : numbers 15-28, 34-47, 60-74, 79-91 

 and 101-14 ; or in other words, to the western end of the experi- 

 mental orchard, a map of which was published in our report for 

 1900. The general character of the trees and their varieties have 

 been previously published, and may be ascertained by referring 

 to the above publication. Tests of the mechanical dilution were 

 made while the work was in progress with the following results : 

 at tree 18 slightly less than 20$ ; at tree 39, 26$ ; at trees 45 and 

 46, 31$; at tree 84 slightly less than 20$, and at tree 101, 33$ 

 of oil. The above figures represent more variation than is desir- 

 able, and yet, so far as we were able to see, the trees suffered very 

 little from the treatment. Inspection a few days after showed 

 that all were well covered with oil, though in some cases where 

 the bark was quite rough, it is probable that there were scales 

 which escaped. 



Examination of these trees the latter part of July showed that 

 while a number of them were rather badly infested by living young, 

 a great many were relatively free. The following were rather 

 badly infested : trees 15, 16, 22, 38, 41-44, 73, 79, 82 and 86. The 

 foliage on tree 101 was light in color, small in size and the growth 

 only fair. It looked as though it had suffered some injury, and 

 undoubtedly the petroleum had hurt the bark to some extent. 

 This injury was also noticeable to a lesser extent on some other 

 trees, the most common indication being much enlarged lenticels, 

 which seemed to be followed by an excessive development of outer 

 bark and a corresponding roughness, so that trees in this condi- 

 tion presented a somewhat bad appearance. 



A general examination of the experimental orchard Sep. 25, 

 showed that the section sprayed with petroleum emulsion was 

 generally in much better condition than that treated with the 

 lime-sulfur wash. A few of the trees in the petroleum section, 

 notably 23, 41 and 75, were badly infested by numerous living 



