260 TWENTY-FIFTH ANNIVERSARY REPORT. 
larger proportion of them are about the sides and the base of the 
leaf. The mite that is responsible for these injuries is a small 
vermiform, four-legged animal, about one one-hundred-and-twenty- 
fifth of an inch in length and hardly visible to the unaided eye. 
The more common food plants are the pear and the apple. Dr. 
Nalepa has also recorded this species on the foliage of the service- 
berry (Amelancher vulgaris Monch), the common cotoneaster 
(Cotoneaster vulgaris Lindl.), the white beam tree (Sorbus aria 
Crantz), the European mountain ash (Sorbus aucufaria L.), and 
the white service tree (Sorbus torminalis Crantz). 
While the leaf blister mite (Eriophyes pyri (Pgst.) Nal.) is the 
most abundant and is responsible for the conspicuous injuries to 
apple foliage, four other species of mites were found which are of 
interest as a matter of record. These are Eriophyes malifoliae 
Parr., Eriophyes pyri var: variolata Nal., Phyllocoptes schlechten- 
dali Nal., and Epitrimerus pyri Nal. With the exception of the 
former, which is new, these species were first recorded from 
Europe. The two latter species have been quite numerous and 
appear to be more common here than on the Continent. 
In the study of the life history of the leaf blister mite it was 
found that the winter is spent in the buds, preferably under the 
second and third layers of bud scales. Upon the approach of warm 
weather, the mites become active and with’ the maturing of the 
buds they seek the epidermis of the undersides of the tender leaves, 
into which they burrow. The irritation produced by these opera- | 
tions in the cellular tissues gives rise to a thickening of the leaf 
which is known as a gall or blister. Within these galls eggs are 
deposited and the young find subsistence. During October the 
mites largely abandon the leaves and swell the numbers already in 
hiding in the buds and in the pubescence of the bark of the new 
wood. Hibernation occurs under the bud scales. 
In the experiments to determine methods by which the mite 
could be controlled on apple trees, tests were made with kerosene 
oil, miscible oil, kerosene emulsion, whale oil soap and the sulphur 
washes; and of these sprays, kerosene either clear or emulsified, 
miscible oil and the lime sulphur wash proved the mose efficient 
remedies for the mite. On account of its safe qualities and cheap- 
ness the lime sulphur wash applied during the dormant season, is 
the most practical remedy for the spraying of apple orchards, when 
treatment is advisable. The mite may be efficiently controlled upon 
