WHITE PIXES OF JAPAN 



193 



PINUS GRIFFITHII McCLELL. 



A small plot of P. griffithii in Hokkaido, 6 years from planting, is 

 shown in Figure 10. Provenances of this species tested so far are very 

 sensitive to frost damage, after which there is often an attack by Valsa 

 sp. When this species is finally able to attain more than 10 m in height, 

 as seen in Tokyo, its good growth rate begins to become apparent. Pissodes 

 nitidus Roelofs attacks its shoots. Damage by this weevil is very severe 

 on this species in Japan. As provenances of P. griffithii that are planted 

 in Japan probably came from the lower slopes of the Himalaya Mountains of 

 India, the winter weather of northern Japan may be too severe for them to 

 show satisfactory growth. 







7^.^^^ 



*skf 



Figure 10. Indian Pinus griffithii planted on the Tokyo 

 University Forest in Hokkaido in 1964. 



PINUS ALBICAULIS ENGELM. , P. FLEXILIS JAMES AND P. LAMBERTIANA DOUGL. 



These three species are now being tested in small stands at the 

 Tokyo University Forest in Hokkaido. But the tops of seedlings of all 

 species have been killed by the cold weather. 



PRESENCE OF CRONARTIUM RIBICOLA IN JAPAN 



More than 15 years ago, Professor Nobukiyo Takahashi, Director of 

 the Tokyo University Forest in Hokkaido expressed the fear that in time 

 P. strobus would be attacked by the white pine blister rust. 



Already, Dr. K. Togashi had reported that in 1922 a rust believed to 

 be C. rihicola was present on Ribes I abi folium Jancz. at Rebun Island 

 50 miles off the northwest tip of Hokkaido (Togashi, 1924). In 1958, a 

 cooperative group under the leadership of the late Dr. Senji Kamei of 



