Z THK LEAF BLISTEB MITE. 
(ions of Europe and in California, producing the so-called " erinose " 
of the vine. Eriophyea padi Nalepa (=1?. prurd-crumena Walsh) 
is the cause of the nail-like galls sometimes found on the leaves of 
plum. (Typhlodrom/us) PhyUocoptea oleivorus Ashmead infests the 
fruit and foliage of the orange, producing a russeted condition. 
PhyUocoptea eomutus Banks feeds upon the upper surface of the 
leaves of the peach, so injuring them as to give the foliage a silvery 
sheen. PhyUocoptes sclilecldendali Xalepa occurs on the foliage of 
the apple, and in Montana very important injuries have been at- 
tributed to it. 
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Fig. 1. — Apple leaves injured by the leaf blister mite (Brtophyea i>>hi). (Original.) 
ORIGIN AND DISTRIBUTION. 
The mite is not native to the United States and was probably in- 
troduced at an early period, presumably from Europe on nursery 
stock, buds, or scions. It was first recorded in the United States by 
Townend Glover, in 1872, and since that date has made its appear- 
ance in the principal pear-growing regions of the United States and 
Canada. It is known to occur in portions of Europe, in England. 
Russia, and Tasmania, and is probably present in other fruit-growing 
regions of the world, being at the present time a truly cosmopolitan 
pest. 
