54 NEW YORK STATE MUSEUM 



The spray was thoroughly mixed and mostly applied here and 

 there upon the trees without attempting to cover the entire leaf 

 surface, since it was presumably sufficiently attractive to the flies 

 so that they would find it if only small areas here and there were 

 covered with the mixture. 



The orchard of Mr Edward Van Alstyne of Kinderhook was one 

 of the places selected for this cooperative work. The first applica- 

 tion was made July 14th and the second the very last of that month 

 or early in August. An examination of alternate sprayed and 

 unsprayed sweet bough apple trees at picking time failed to disclose 

 any well-marked difference between the two. The infested portion 

 was so limited that it was impractical to use large plots or different 

 orchards for the purpose of comparison. 



The other orchard was that of Mr George T. Powell of Ghent. 

 Mr Powell was much interested in the control of this insect, owing 

 to his having lost, through its work, a large crop of Cox orange 

 pippins in 19 14 and a light crop in 191 5. Owing to the value of the 

 fruit he was willing to spray more frequently than would be prac- 

 tical with the average commercial grower. The formula given 

 above was used and his record of treatments follows: 

 July 15, sprayed Cox orange pippins, no flies were visible. 

 July 16, sprayed experimental block of dwarf trees; on the 17th 



it rained most of the day and on the 19th one sus- 

 picious fly was found. 

 July 25, sprayed the Cox orange pippin trees and found a few 



flies, one dead on a leaf; rain occurred the next day. 

 July 27, sprayed the Cox orange trees very thoroughly, also 



sweet bough and Mcintosh, found some dead flies on 



the sweet bough. 

 August 4, sprayed Cox orange trees, also the experimental block. 



Flies were seen only on the sweet bough, being 



plentiful. 

 August 6, sprayed Cox orange lightly on the tops and also the 



sweet bough and Mcintosh trees. 

 August 19, sprayed the Cox orange trees and saw no flies. The 



weather was very hot and dry. 

 August 20, sprayed the Mcintosh and also the fall strawberry 



nearby. The weather continued hot and dry. 



Unfortunately, so far as the work at Ghent was concerned, the 



efforts were concentrated on the Cox orange pippin trees and it 



was not until after the season had advanced so far that special work 



with earlier varieties was out of the question that we could be cer- 





