174 MAINE AGRICULTURAL EXPERIMENT STATION. I916. 



clusters were injured more or less and occasionally the flower 

 buds were killed except the central one or two in the cluster. 

 On May 25, or about three weeks after the dormant spray was 

 applied, the evidence of injury had so largely disappeared that 

 a person not knowing about it would not notice it in passing 

 through the orchards. However, on some trees where the 

 worst injury was noted quite a number of bud clusters could 

 be found where all but the central bud had been destroyed. 

 From the early part of June and following, the trees on this 

 plot appeared as healthy as any of the others, although the 

 leaves were a little smaller at first. The amount of fruit 

 which finally set was apparently fully as much on the average 

 as on other trees which did not receive the late dormant spray. 

 It was noticed early in the season that the fruit on this plot 

 showed considerable russeting. 



As usual the plot sprayed 3 times with bordeaux mixture 

 showed a large amount of spray injury. By June 15 numerous 

 leaves showed spotting and quite a percentage were turning 

 yellow and falling. Russeting of the fruit was apparent when 

 the latter was quite small. 



Spray injury was also later recorded on the leaves of the 

 trees on plot 4 where a single early application of bordeaux 

 mixture was applied, followed by double strength arsenate. of 

 lead for later applications. On July 1 it was noted that some 

 of the leaves were turning yellow and falling. A careful ex- 

 amination on July 8 indicated that spray injury, though com- 

 mon on the leaves, was not severe. It was, however, by no 

 means confined to those leaves which had been formed before 

 the single application of bordeaux mixture tWas made. No 

 such injury could be found on the adjoining plot where the 

 double strength arsenate of lead alone was used for all appli- 

 cations. 



Throughout the season no differences with regard to spray 

 injury could be detected on the remainder of the plots, includ- 

 ing plot 3 which received a blossom bud application of lime- 

 sulphur, 20 per cent stronger than standard. A very slight 

 amount of injury undoubtedly occurred but this was compli- 

 cated with the frost injury of the early spring and the leaf 

 scorch of late summer which made it difficult to decide how 

 much of the trouble should be ascribed to each factor. 



