388 Report of the Horticultural Department op tub 



trees were sprayed repeatedly while tliey were in bloom for the 

 purpose of hitting so far as possible the blossoms as they opened 

 from day to day. The treatments began with the first blossoms 

 which opened and continued till the last ones appeared. The 

 "^pray mixture used was Bordeaux mixture, 1-to-ll formula, com- 

 l)ined with green arsenite of copper, 1 pound to 150 gallons. 



A Mcintosh apple tree which had been topworked to this 

 variety 13 years ago, was selected for one of the tests. It was 

 not so high as to prevent the thorough spraying of all parts. 

 It had an abundance of blossom buds which w^ere quite evenly 

 distributed over the tree. Two limbs on the east side were 

 .sprayed and the rest of the tree was left unsprayed. The num- 

 ber of treatments is stated below. 



McIntosh Sprayed Repeatedly While in Bloom. 



wP^ll^L Condition of Bloom. 



May 15. . First blossoms are now open. 



Mav 16 S ^^^^^ than 75 per ct. of the clusters have all of the buds 



( now open. 

 May 17. . From 75 per ct. to 90 per ct. of all blossoms are now open. 

 Mav 19 ^ Petals of first blossoms are failing. AH' other blossoms are 



} practically now in full bloom. 



r A few clusters have one or two blossoms with petals still 

 May 21. . <( attached to them. Probably 95 per ct of all of the blossoms 



l have passed out of bloom. 

 May 22. . Tree almost entirely out of bloom. 

 May 23. . Tree entirely out of bloom. Spraying now discontinued. 



Ten days after this tree went out of bloom, before the first 

 -dropping of young fruits had begun to any appreciable extent, 

 small branches which appeared to represent fairly the condition 

 of the sprayed side of the tree were compared with correspond- 

 dng branches from the unsprayed side of the tree. Every cluster 

 was examined to see whether any fruit had set. The following 

 table shows the number of clusters which set fruit, and the 

 whole number of fruits which set on typical branches sprayed 

 repeatedly in bloom compared' with the numbers on typical 

 branches which were not sprayed in bloom. 



