APPLE SPRAYING EXPERIMENTS IN I915. 173 



leaves and fruit on the unsprayed check plot and an occasional 

 affected leaf was seen on the trees sprayed with the extra fine 

 sulphur. No scab was observed on the leaves of any of the 

 trees of the remaining plots then or later in the season 



Records were kept during the season as to the appearance of 

 scab on the fruit on the different plots, but these contain noth- 

 ing of value which is not given in the tabulated results of the 

 condition of the fruit at harvest time. 



Spray injury during the summer. On a few nights about 

 May 15 the minimum temperature recorded at the farm was 

 only slightly above freezing. These low temperatures at one 

 time at least were accompanied by strong winds, and resulted 

 in considerable foliage injury, more particularly on the north- 

 west sides of the trees. This made it difficult in some in- 

 stances to determine just how much of the injury should be 

 attributed to the spray. Also late in the season a certain 

 amount of scorching and browning of the leaves, resembling 

 injury due to weather conditions, was observed all through the 

 orchards. This was less, however, on the unsprayed trees than 

 on the other experimental plots and the remainder of the 

 orchards. 



Plot 8, sprayed on May 3, with dormant strength lime- 

 sulphur, after the leaves surrounding the bud clusters had 

 begun to show, did not give any evidence of spray injury for 

 at least 3 days. On May 7 very slight traces of burning of the 

 buds began to appear. The leaves of the latter had grown but 

 slightly in the meantime but on this date the margins of some 

 of them had begun to turn brown, particularly at the tips. 

 One bud was found where the entire outer leaves were browned. 

 On May 10, one week after the spray was applied it was ap- 

 parent that the young leaves on fully 50 per cent of the smaller 

 and more tender buds had been injured. When compared with 

 those on unsprayed trees, they showed a decided checking in 

 growth. The buds at this time were fully double the size that 

 they were on May 7, the cluster leaves being from one-half to 

 three-fourths inch long and the enclosed blossom buds being in 

 some instances one-eighth inch or more in diameter. As far 

 as could be determined then the injury was confined to the 

 outer leaves and did not effect the blossom buds within. 



On May 14 the evidences of injury were rapidly disappearing. 

 In some instances it was quite evident that the flower bud 



