32 The San Jose Scale in Japan. 



Kwaitakushi-experiment field, Tokyo, whence the trees were sent all over 

 the empire directly or indirectly. 



5. No scale was discovered on trees and shrubs in the wild regions. 



6. The scale was not found in uncultivated higher lands and moun- 

 tains ; the scale, found on high lands as in some parts of Shinano and 

 Hikosan, Bazen, was discovered on cultivated plants recently introduced. 



7. In almost every instance the infested trees were comparatively 

 young. 



8. Low and comparatively moist regions are favorable to the scale, 

 hence it predominates in the regions not higher than 100 metres above the 

 sea level. 



9. The wild plant is free from the scale. 



10. The wild pear (Pirus toringo) in the wild region in the vicinity 

 of Morioka city was free from the scale. 



11. Two varieties, Aspidiotus perniciosus, var. albopunctatus and 



ASPIDIOTUS PERNICIOSUS, VAR. ANDROMELAS 



described as being from Japan, are proved to be variations in colour and 

 habit of the true San Jose Scale (Aspidiotus perniciosus), and thus could 

 not be separated from the original species. 



12. The scale on citrus trees in Japan is the same as that on other 

 hosts. 



13. The chief favorite food of lady bug (Ghilocarus similis) seems to 

 be DiASPis PENTAGONA, but it freely feeds upon the San Jose Scale and 

 other small insects, as aphis etc. 



14. The fungus disease is found very freely attacking the scale in Japan, 

 in many localities, however this disease more commonly attacks D. pen- 



TAGONA. 



15. Except in a few localities the scale is not very effective in Japan ; 

 generally it has not been found to spread rapidly. 



16. Since the fruit growers have been learned about the scale, they are 

 taking proper care, using the best method to control or destroy it. 



17. With proper care together with the aid of natural causes, the scale 

 is readily kept in check. 



