388 REporRT OF THE HORTICULTURAL DEPARTMENT OF THB 
trees were sprayed repeatedly while they 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 
spray mixture used was Bordeaux mixture, 1-to-11 formula, com- 
bined with green arsenite of copper, 1 pound to 150 gallons. 
A McIntosh apple tree which had been topworked to this 
variety 18 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 were 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, 
Date of ‘3 
Treatment. 
May 15.. First blossoms are now open. 
May 16.. More 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. 
May 19.. | Petals of first blossoms are failing. All other blossoms are 
practically now in full bloom. 
A few clusters have one or two blossoms with petals still 
May 21..4 attached to them. Probably 95 per ct. of all of the blossoms 
( have passed out of bloom. 
May 22.. Tree almost entirely out of bloom. 
May 238.. Tree entirely out of bloom. Spraying now discontinued. 
Condition of Bloom, 
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- 
ing 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, 

