.>Q The San Jose Scale in Japan. 



San Jose Scale, the former species has no white dot or ring on the male scale, 

 while the latter attacks citrus growth. The professor might be right in 

 distintruishing these two forms from the true San Jose Scale by the above 

 given characters ; but according to the facts which we have collected from a 

 comparative study of a great many individuals, both from the same and from 

 different localities in the country, and from some foreign specimens, we have 

 become able to conclude that the characters, forms and colours, which have 

 been claimed for the so called new varieties, are common with the San Jose 

 Scale ; and that no basis for a contrary statement can be found on sach 

 supposed distinctions. 



In a group of male scales we have found that some specimens have a 

 distinct dot and ring, while others are without both of them ; and so also 

 some have only a white dot or ring leaving a black sculpture, while others 

 have a white dot with a crescent or half a ring. The colours of the male 

 scales vary from light yellowish gray to black with all kinds of intermediary 

 shades : some specimens are almost gray in colour, and such are generally on 

 the old trees exposed to the weather in comparatively high regions ; the 

 young specimens on young stock are always blackish in colour ; the scales 

 on leaves are usually of a pale yellowish tint. 



It is said that the scale does not attack the citrus trees in America, so 

 when Prof. Cockerell had seen the scale from Japan attacking citrus growth, 

 he considered it to be a new variety of the San Jose Scale ; from our 

 observation we have learned that the San Jose Scale readily spreads to the 

 citrus as well as to other iruit trees. This was learned by experiments made 

 by Mr. S. Hori in our station. 



A lot of citrus stock, sent to Miye-ken from Itami near Osaka in the 

 Spring 1902, was badly attacked by the scale ; the trees were grown beside 

 other fruit trees in a nursery : the writer at once said there was but little 

 doubt that the scales on the trees came from other infested slock in the 

 nursery ; he examined the insect very carefully, and found it identical with the 

 San Jose Scale. It is true the infested citrus trees, on which Mr. A. Craw 

 found the scale some years ago, were sent from this region through a nursery 

 man in Yokohama. 



