404) K.BPORT OF THE HORTICULTURAL DEPARTMENT OP THB 



sprayed on the east side only. Later they were sprayed on the 

 opposite side. 



Three trees of Alexander, 6 of Twenty Ounce, 4 of Pumpkin 

 Sweet (commonly called Pound Sweet), 3 of Baldwin and 3 of 

 Hubbardston were similarly sprayed in bloom and an equal num- 

 ber of corresponding trees of the same'varieties not sprayed in 

 bloom were compared with them. 



Observations later showed that on the treated trees many 

 blossoms had been destroyed by the treatment. On the treated 

 Baldwin the fruit which had set generally developed either from 

 the very early or from the late blossoms. Plate LVII, Fig. 1, 

 shows a treated cluster in which no fruit has developed except 

 possibly one from a late, outside blossom. On corresponding 

 Baldwin trees which were not sprayed in bloom, not only had 

 the center blossom of the cluster generally set, but often two or 

 three or more of the other blossoms of the cluster had also set 

 fruit as shown in Table XII and illustrated by Fig. 2, Plate 

 LVII. 



These results indicate that at the time when the spraying was 

 done the earliest of these Baldwin blossoms were already too far 

 advanced and the latest were not open enough to be injured by 

 the spray, while the lately opened mid-season blossoms generally 

 succumbed to the treatment, probably because the process of 

 fertilization had not yet progressed far enough to place them 

 beyond danger from the poisonous effect of the spray mixture. 

 For a comparison of the number of blossoms which set on the 

 Baldwin and Pumpkin Sweet which were sprayed in bloom and 

 on the corresponding trees not sprayed in bloom, see p. 393. On 

 the Oldenburg trees the earliest blossoms to open were generally 

 the ones which were killed by the spray; in many cases only the 

 center blossom of the cluster was killed. The fruit which set on 

 Oldenburg sprayed in bloom generally developed from the blos- 

 soms which opened in mid-season or later. 



When the June drop of fruit occurred, Mr. Collamer reported 

 that he could see no difference between the trees sprayed in 

 bloom and those not so treated in the percentage of the fruit 



