THE LEAF BLISTER MITE OF PEAR AND APPLE. 5 
bud scales, where they feed, many molting at this time. With the 
bursting of the buds and the pushing out of the tender leaves, these 
are attacked and the characteristic blisterlike spots soon develop. 
Notwithstanding the minute size of these creatures, they fall prey 
in considerable number to the attack of a mite (Seius pomé Parrott) 
which is thought to assist materially in reducing their numbers. 
METHODS OF CONTROL. 
The leaf blister mite will yield to thorough treatment with kero- 
sene emulsion, miscible oils, or lime-sulphur washes. The use of 
Fic. 4.—Leaf blister mite (Briophyes pyri): 1, Dorsal view; 2, ventral view. Greatly 
enlarged. (After Nalepa.) 
these sprays. as for the San Jose scale, should also protect orchards 
from important injury from the mites. When it is necessary to 
spray for the mites alone, and in cases of severe infestation, as has 
been noted in apple orchards in New York State, two treatments 
have been recommended by Parrott, standard kerosene emulsion 
being used, diluted with 5 parts of water. One application should 
be given in late fall as soon as most of the leaves have fallen and 
