188 THE CANADIAN ENTOMOLOGIST 



stock is slight and, as a pest of older trees, it cannot be considered 

 as being of a very serious nature. 



The Apple Leaf Mite (Eriophyes malifolice). 



Regarding this mite Parrott (2) says: "This is a vagabond 

 species and is found in association with Eriophyes pyri and Phyllo- 

 coptes schlectendali , upon the under surface of apple leaves." 

 From this it is apparent that he regards this mite as of secondary 

 and minor importance and not able, by itself, to infiict much in- 

 jury. While we have never seen any particularly destructive 

 outbreaks, it is possible that this mite may prove to be of greater 

 economic importance than is commonly supposed, at least under 

 conditions that exist in the Okanagan. 



In view of the resemblance between the injuries produced 

 by the former species discussed and a fungous disease, it is an in- 

 teresting fact, that this mite causes symptoms strikingly like an- 

 other fungous trouble, viz., Apple Scab {Venturia pomi). The 

 mites work on the underside of the leaves, concealed by the pubes- 

 cence, and the first indication of their work is in the form of more 

 or less olive-green, circular spots on the upper surface, which 

 gradually darken until they become dark brown in colour. These 

 spots become slightly raised above the surface of the leaf, form- 

 ing a saucer-shaped hollow on the underside. These symptoms 

 are so suggestive of apple scab, that it is not surprising that they 

 have been mistaken for this trouble even by those familiar with 

 the disease. , Not only were the leaves affected but the tender 

 shoots were also attacked, causing them to wither and become 

 brown and dead. This appearance is suggestive of the damage 

 done to pears by Phyllocoptes scliJeclendali, as described by O'Gara, 

 but was noticed where only Eriophyes malifolice was present. 

 This type of injury was very prevalent during the summer of 

 1913. 



Unfortunately we were prevented from making observations 

 regarding the hibernating habits of this species, but we feel certain 

 that a careful study of its life history and habits would reward 

 research. It is altogether possible that these two species discussed 

 in this article are responsible for much more damage than is com- 



