ISEW York Agricultural Experiment Station. 407 



under experiment. It was made May 7, after the leaf buds 

 opened but before any of the blossoms were open.^ 



The second treatment for the ti'ees which were sprayed in 

 bloom was made May 21, to 14 Baldwin and one R. I. Greening 

 tree and to the north side of five other R. I. Greening trees. 

 This spraying was done with especial thoroughness so as to hit 

 as many of the open blossoms as possible. Nearly all of the 

 blossoms were open at this time. The trees showed an unusual 

 abundance of bloom. The second treatment for the correspond- 

 ing trees which were not sprayed in bloom was not given till 

 May 29 and June 1 when the trees were just out of bloom. At 

 this time 14 other Baldwin trees were sprayed and also the south 

 side of the five R. I. Greenings which had been sprayed on the 

 noirth side May 21. This treatment was made just as thoroughly 

 as the treatment of May 21. 



The third treatment was given to all trees alike June 11. The 

 fruit was then about the size of cherries. 



In all these treatments Bordeaux mixture, 1 to 10, was used 

 combined with sodium arsenite. The latter was used at the rate 

 of f lb. of the white arsenic from which it was made to 100 gal- 

 lons of the spray mixture. 



Effect of the spray upon the open hlossoms. — The trees which had 

 been sprayed in bloom were examined May 29 and it was evident 

 that very many of their blossoms had been killed by the treat- 

 ment. Nevertheless the bloom had been so abundant that includ- 

 ing the comparatively few, but really large number, which had 

 escaped injury because they were not open May 21, there were 

 enough blossoms which were not hit by the spray, to provide 

 for a fair to good setting of fruit. Even on trees which were not 

 sprayed in bloom Mr. Wilson estimated that 90 i>er ct. of the 



'The row of Baldwin trees not sprayed in bloom was treated with Bor- 

 deaux mixture alone May 4 just after the leaf buds opened but the rain 

 interfered with continuing the treatment to the row which was to be 

 sprayed in bloom. On May 7 they were treated with Bordeaux and 

 sodium arsenite as were also the trees which were to be sprayed in Lloom. 

 This is what is called above the " first treatment." 



