320 Report or THE DEPARTMENT OF ENTOMOLOGY OF THE 
Results on blister-mite— On April 8, the leaves of the unsprayed 
trees were nearly all infested with the blister-mite while the sulphur- 
treated trees were apparently unaffectd. By May 16 there were 
a few leaves on four of the sprayed trees that showed slight traces 
of the mites but the remaining sulphur-treated trees showed no 
evidences of infestation. About June 25 the new growth of the 
checks was being attacked by the mites while the sprayed trees had 
clean foliage except in a few instances. A careful examination on 
August 1 showed that there were eight trees in the sprayed lot that 
had traces of mite work while the checks, without an exception, 
were well infested with the mites. 
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 that had appeared after June 15 
was still adhering on October 30, while the unsprayed trees were 
nearly bare. The leaves set before June 15 on both the sprayed and 
unsprayed trees were very much affected by leaf rust (Gymnospo- 
rangium 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 mite. On account of the small size 
of the trees this seemed a practical method of controlling the pest 
and was one that had been commonly recommended. 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 care- 
fully examined again when it was found that a number were abund- 
antly infested. Later studies of the habits of the mite have shown 
that during the early summer the mites do not confine their oper- 
ations entirely to the leaves as they may feed and breed in large 
numbers during the growing season upon the young forming buds 
and in the pubescence of the bark of the new growth. When 
the conditions are favorable for the rapid multiplication of the 
mites there is doubtless considerable migration of the mites from the 
older leaves to the new growth. The failure to control the mite by 
