. Biology of rust resistance in forest trees : proceedings of a NATO-IUFRO advanced study institute, August 17-24, 1969. Trees; Pine; Trees; Rust diseases. 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 sho
. Biology of rust resistance in forest trees : proceedings of a NATO-IUFRO advanced study institute, August 17-24, 1969. Trees; Pine; Trees; Rust diseases. 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 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 Iabifolium 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original North At
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Keywords: ., bookauthoruni, bookcentury1900, booksubjectpine, booksubjecttrees
