マサキに寄生するウドン粉病菌の越冬に就いて
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概要
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The scientific name, Uncinula Evonymi-Japonicae HARA^<(4)> was given to the powdery mildew fungus of Evonymus japonicus THUNB. it 1921 by Hara. Later HINO^<(5)> and KITAZINTA^<(8)> reported respectively the impossibility to find the perithecia of this fungus and it was also in vain for the author to find them near the city of Fukuoka. It is a question how the fungus be possible to live throughout the winter. The purpose of this paper is to find out the place of the hibernation of the mildew fungus and the form of the fungus at that time. The experimental results are as below: (1) The perithecia were not found in any parts of the host plant. (2) The conidia are ill-adapted to survive from one season to the next. (3) The wind-borne conidia are unable to attack the old leaves when they become old. (Fig. 3, 4) (4) The fungus does not exist within the dormant buds with any forms. (5) The first conidial formation in early spring is observed on the lesions of the preceding year's leaves and that after twenty days the first infection occurs on the young emerged leaves from dormant buds. (Fig. 1) (6) Overwintering hyphae with haustoria are found on the lesions of the preceding year's leaves, which are capable to overwinter and to produce conidia in the next spring. (Fig. 9) From this experimental results it is offered that the fungus overwinters on the lesions of the preceding year's leaves of Evonymus japonicus (evergreen tree) in the form of the peculiar superficial mycelia with haustoria.
- 日本植物病理学会の論文
- 1953-03-31
著者
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