EXPERIMENT STATION REPORT. 649 



in all stages, from the minute yoimg to the adult. The applica- 

 tion was very thorough, made so as to hit the underside of the 

 foliage, and extended beyond the vine limits to hit the flying 

 specimens. Two days later the number of leaf hoppers had been 

 very decidedly reduced. There were still a considerable number 

 of adults and partly grown individuals, but not nearly so many 

 as there were when the spraying was made. A distinct coating 

 was left on the underside of many of the leaves, making them 

 look discolored; but as a matter of fact there was no real injury 

 of any kind to' the foliage. The application may be considered 

 as rather a satisfactory one and would have been duplicated had 

 it not been desired to test another material on the same class oi 

 insects. 



On July 5th, sprayed experiment trees 18, 19 and 21, all Ver- 

 mont Beauty pears, on which larvae and recent sets were moving 

 in considerable numbers and spotting the fruit. Five gallons 

 were put on these trees, making the application a regular drench. 

 Two days later no moving larv?e were found on the sprayed 

 trees and many of the recent sets had collapsed; but the older 

 sets seemed to' have escaped injury very largely. On tree 18, 

 the scales recovered so fast that it was necessary to re-spray 

 August 19th, and again August 29th, with the same material, 

 and on September i6th. a soluble crude petroleum was applied, 

 closing the career of the compound on this tree. Tree 19 was 

 not resprayed with the compound until August 29th, but the 

 effect -liere was also so unsatisfactory that the soluble petroleum 

 was resorted to September i6th. Tree 21 had the same history 

 as tree 19. 



July 8th. sprayed experiment trees i, 2, 7, 8, 15, 20, 23, 24, 26, 

 30, 31 and 38. 



Tree i. Mariana Plum. Had been previously treated with 

 a winter \\ash and with the Pyrol spray ; but was again in need 

 of attention. This application produced very temporary re- 

 sults and others were made of the same strength. August 19th 

 and 29th, resulting only in checking development until October, 

 when Kill-O-Scale was substituted. 



Tree 2. Yellow Transparent Apple. Had been previously 

 treated with a winter wash and with Pyrol tree spray ; but again 

 needed attention. The further history as to re-spraying is as 

 for No. I, except that it became necessary to suljstitute petro^ 

 leum, as early as September 21. 



Tree 7. Champion Peach. Had been previously treated with 

 a winter wash, which had not been effective. This application 



