2 THE LEAF BLISTER MITE. 



lions of Euroi^e and in California, producing the so-called " erinose " 

 of the vine. Eriophyes padi Xalepa {^E. pruni-crinnena "Walsh) 

 is the cause of the nail-like galls sometimes found on the leaves of 

 plum. {Typ>hlodro7ni!s) Phyllocoptes oJeivorus Ashmead infests the 

 fruit and foliage of the orange, producing a russeted condition. 

 PJiyllocoptes conmtvs Banks feeds upon the upper surface of the 

 leaves of the peach, so injuring them as to give the foliage a silvery 

 sheen. Phyllocoptes schleclitendali Xalepa occurs on the foliage of 

 the apple, and in Montana veiy important injuries have been at- 

 tributed to it. 



Fit;. 1. — Apple k'avfs injured by the leaf blister mite {Erioijltuf.v ixjii)- (Original.) 



ORIGIN AND DISTRIBUTION. 



The mite is not native to the United States and was probably in- 

 troduced at an early period, presumabl}^ from Europe on nursery 

 stock, buds, or scions. It was first recorded in the United States hy 

 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. 



