New YorxK AGRIicULTURAL EXPERIMENT STATION. 317 
The work of the mite has been recognized on over two hundred 
and fifty varieties of apples. Some of the Jeading varieties sustain- 
ing severe injuries to the foliage are the Baldwin, Rhode Island 
Greening, Sutton, Fall Pippin, Ben Davis and King. The leaves 
of William Favorite in the Station orchard have been the worst 
affected and the trees have for two years shown marked unseason- 
able defoliation. 
MITE INJURIES CONFUSED WITH SPRAY INJURIES. 
Injuries by the mite and by spraying mixtures often appear upon 
the same leaf and have been much confused. The two are quite dis- 
tinct and may be easily distinguished. Injuries due to treatment 
by the bordeaux-arsenical mixtures appear as dead brown spots of 
various sizes and shapes, and are irregularly distributed over the 
leaf surface. Frequently these spots are roundish or circular with a 
diameter of one-twelfth to one-eighth of an inch, while others are 
irregular in outline and much larger. Although the line of demar- 
cation between the dead and living tissue is sharp, these spots 
are to the touch flat, often depressed, and are not in this manner 
distinguishable from the general surface of the leaf as are the mite- 
blisters. Spray-injured spots show the venation of the leaf which 
is seldom apparent in the mite galls, and the dead areas also lack 
the small hole leading to the interior, which is always present in the 
corky spots produced by mites. 
MITE INJURIES CONFUSED WITH APPLE RUST. 
In the Hudson Valley and Long Island, the rust is quite common 
and is often mistaken for the work of the blister mite. This disease 
may be distinguished by the presence of circular, orange-colored 
spots of one-quarter of an inch in diameter, which encircle dead 
brown irregular areas, and which are variously distributed over 
the leaf surface. Upon the undersides of the leaves the rust appears 
as brown calloused areas showing the characteristic cluster cups 
which are not present in the galls of the mite. 
AN ENEMY OF THE BLISTER MITE, 
The apple and pear blister mite is much subject to the ravages 
of a gamasid mite, Seius pom. This was very abundant this season 
upon infested trees and undoubtedly materially assisted in reducing 
