New York AGRICULTURAL EXPERIMENT STATION. 351 
injury to the fruit however became less prominent as the season 
advanced. All the treatments caused an equally severe injury. 
On plums, with 3 per ct., 5 per ct. and 7% per ct. Scalecide.— 
The applications of the 5 per ct. and 714 per ct. strengths seemed 
safe. But later in the summer further experiments were made to 
determine if the oils were uniformly safe to plum foliage. In this 
work the results were quite different, for the fruit was badly 
spotted and the leaves burned, which resulted in severe defolia- 
tion. 
EFFECT ON SCALE. 
The trees receiving treatment during the dormant season ap- 
peared to be entirely free from living scale when examined during 
June, July, and the first week in August. During the last week in 
August young living scales were detected upon the trees receiving 
applications of 5 per ct. and 10 per ct. oil. No living scales were 
seen on the trees sprayed with the 15 per ct. oil at any time during 
the summer. The appplications containing 38 per ct. Scalecide 
seems to have little or no effect upon the scale. 
SUM MARY. 
A careful examination of the results obtained by the use of this 
oil showed that spraying during the dormant season was accom- 
panied with a great retardation of the buds. But later these 
opened so that ultimately there was little difference in this respect 
between the sprayed and unsprayed trees. The results in this 
particular attending applications of 5 and 10 per ct. Scalecide 
were not important, but the retardation following the treatment 
with the 15 per ct. oil was very severe. In many cases the treat- 
ment seemed to promote the growth of better foliage. Summer 
spraying with Scalecide in every instance caused severe injuries. 
In these experiments, 3 per ct. Scalecide had no appreciable effect 
on the scale. Applications containing 5 per ct. and 10 per ct. oil 
seemed to destroy from 80 to 95 per ct. of the scale. The higher 
percentage seemed to entirely control the scale. 
While the Scalecide at first gave promising results, it seems 
best in view of the variable results upon scales and trees in all in- 
stances in the later work to continue these tests to determine its 
merits as an orchard spray. 
