300 Report of THE DEPARTMENT OF ENTOMOLOGY OF THE 
Conditions.— The spraying was begun in this orchard April 7, 
but owing to bad weather it was not completed until April 16. 
The buds were well advanced and in many cases the young 
jJeaves were beginning to appear. During every day that the 
trees were being treated the work was delayed by rain. On 
the afternoon of April 8 rain began and continued in frequent 
showers until the morning of April 10. On this date the weather 
was very windy and threatening. The following morning was 
bright but in the afternoon a very heavy thunder storm pre- 
vented further work. The rain continued during the night and 
intermittently during Saturday morning. Heavy showers con- 
tinued at frequent intervals until April 18. The heavy rains 
which came before the mixture was dry washed so much of it 
olf as to make it necessary to go over the trees again. 
The method of applying the wash was the same in this orchard 
as in the others. The trees were retouched twice and when the 
work was completed they had the appearance of being white- 
washed. <A barrel pump with two leads of hose and Vermorel 
nozzles were used in this orchard. The amount used, including 
the material washed off by the rains, averaged two and one- 
half gallons per tree. 
The exact number of rainy days during the thirty days follow- 
ing the treatment was not ascertained. During April and May, 
however, there were frequent heavy showers accompanied by 
high winds. From April 15 to 30 there were frequent rains with 
especially heavy showers on the 28th, lasting most of the after- 
noon and evening, and several days of severe winds. 
Effect on the trces.—As was the case with the apple trees, the 
opening leaf buds of both pear and peach trees were burned by 
the spray. The immediate effect of the treatment was also to 
delay the further development of the buds for about a week, 
thus giving the impression that the trees were injured. Later 
examinations showed that this was not the case. The foliage 
on the treated trees was uniformly much more abundant and 
of better color than that of the check trees or that of nearby 
orchards infested with the scale. There was not the slightest 
evidence of injury to the foliage or fruit buds. The amount of 
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