Ito, K., Y. Zinno, and Y. Suto. 1975. Dothistroma needle blight of pines in Japan. Govt. Forest Expt. Sta. Bui. 272: 123-140. (Tokyo, Japan).
Since 1952, the Dothistroma needle blight of pines has been found in several parts of Honsyu and Hokkaido of Japan. The causal fungus was morphologically identical with Dothistroma pini Hulbary var. pini. Host plants of the fungus hitherto collected in Japan were as follows: Pinus densiflora, P. thunbergii, P. elliotii var. elliottii (P. caribaea), P. montana, P. jeffereyi, P. ponderosa, and P. controta. In artificial inoculation with the fungus, the infection occurred more severely on pine needles wounded slightly than on those unwounded. Artificial inoculations with the fungus isolated from Pinus thunbergii were made to the following pine species: Pinus densiflora, P. thunbergii, P. taeda, P. elliotii var. elliottii, P. pinaster, and P. radiata. Results showed that all the species tested were equally susceptible, and the incubation period of the disease was 2-6 months. In Japan, the disease has been generally considered to be a minor obstacle to forest trees, because its damage to the native pine species is still not serious.
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