302 REPORT OF THE DEPARTMENT OF ENTOMOLOGY OF THE 
Results on pear trees.—The trees were uninjured by the treat- 
ment. The applications of the sulphur washes destroyed the 
lichens and left the bark clean. All foliage set after June 15 
was still adhereing on October 20, while the unsprayed trees were 
nearly bare. All foliage set prior to June 15 on both the sprayed 
and unsprayed trees was very much affected by leaf rust 
(Gymnosporangium sp.). Duchess and Seckel pears in the same 
orchard were free from this disease and also from the blister 
mite. 
Hand picking of infested leaves—During the years 1903 and 
1904 Mr. Sirrine conducted some experiments to determine the 
value of such treatment for the pear blister mite. During the 
last week in May, 1903, all infested leaves from five trees were 
removed and carried out of the orchard. One week later five 
more trees were treated in the same manner. An examination 
of these same trees on June 29 showed slight traces of infestation 
of the newly developed leaves. On May 16, 1904, these trees were 
carefully examined again when it was found that a number were 
abundantly infested. It is likely that the destruction of the 
infested leaves for two years in succession would have given 
more satisfactory results. At the best this method of fighting 
the mite is only practicable upon small trees and does not appear 
as effective as a thorough treatment during dormant season with 
a contact spray. 
ORCHARD III. (WESTCHESTER COUNTY.) APPLES AND PLUMS. 
This orchard is located near Yorktown. The apple trees vary 
from 30 to 50 years of age. These have for the past ten years 
received very careful attention with respect to the cultivation 
and spraying. The leading varieties are Baldwin, Gravenstein, 
Nonesuch and Roxbury. For the experiment 276 trees which were 
variously infested with scale were used. In the work with the 
plums 434 trees of the varieties Burbank, Lombard and Satsuma 
were selected for treatment. These were variously infested with 
scale but have been given the best of care. 
Conditions.—Spraying with the sulphur washes was begun in 
this orchard on April 7 but owing to rains it was not completed 
until April 12. During every day that the trees were being 
treated the work was delayed by rains. On the evening of the 
7th showers fell which continued at irregular intervals during 
the following days until the morning of the 12th when there 
was a heavy rain. The bordeaux-arsenical mixtures were applied 
April 18-20, June 2-6 and July 6-8. Owing to interference by 
