]Q The San Jose Scale in Japan. 



42. EagosMma-lien. 

 Only a single locality is known to be infested by the pest. 



VII. Epoch of exportation of Japanese vegetation. 



When Mr. A. Craw of the quarantine oftice at San Francisco, California 

 had two or three times found the San Jose scale or so called subspecies of the 

 same on plum and other trees from Japan, notably on a plum tree arrived 

 Jan. 28th 1898, the discussion of the question of its jiative home once more 

 became a burning question in America, and souje paople firmly believed that 

 its native home might be proved to be Japan ; many articles then appeared, 

 and in one of them Prof. F. M. Webster, Ohio agr. experiment station said* 

 " As I have been able to prove aln:)0st conclusively it came to us from 

 Japan." 



It is clear however that almost all articles and papers dealing wuth the 

 original home of the scale were based upon fragmentary facts, and thus no 

 firm basis for this conclusion was established. The ornamental, flowering 

 and fruit trees of the empire bad been shipped to the west steadily in 

 enormous quantities for more than two centuries, before the time when 

 Commodore Perry opened the door of the empire by the treaty signed by 

 him in 1854. Since that time the exportation of Japanese vegetation has 

 been increasing in amount ; but during that whole period the scale was not 

 found on the plants that were exported. 



The stock on which Mr. Craw had found the scale in 1898 was shipped 

 from Yokohama, and produced in a nursery where the scale was first intro- 

 duced with the infested foreign stock some years before. 



The following table shows the period of exportation of Japanese plants 

 to foreign countries : — 



Report of Ent. society of Ont., 18^18, pp. 3. 



