カンキツかいよう病菌Xanthomonas citri (Hasse) Dowsonの腐生的生存に関する研究 : 第III報腐生的生存菌の感染菌量について

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This paper describes the results of a study on the possibility of the infection of citrus plants due to Xanthomonas citri surviving on the rhizomes of Zoysia macrostachya, root systems of host plants, rice straw mulch or plain soils. Those materials put in the boxes of 40×60×15 cm in size were artificially infested by the suspensions of X. citri. The Natsudaidai seedlings at the ten-unfolded leaf age were used as the test plants, and weakly wounded by scratching the leaves with a sand paper prior to the inoculation. Six pots of the individual test plants were placed on the surface of the soil in a box. Inoculation of the test plants was made by splashing with shower produced by a DIK automatic rain simulator which was adjusted for the 50mm precipitation per hour. For this splash inoculation, ten-minute shower was given three times at 8-hour intervals. After inoculation, the test plants were transferred to a green house and observed for the disease development. The leaf infiltration technique was applied for assaying the population of X. citri in the saprophytic forms. As shown in Figs. 1 to 6, the minimum density of X. citri for infection was around 10^2 per gram samples regardless of the kind of the infested materials. Above this level, the infection ratio increased in parallel with the population of X. citri surviving under the given conditions. The vegetations, either the rhizomes of Z. macrostachya or the root systems of Natsudaidai, substantially increased the infection by the prolonged longevity of the bacterium. The rice straws provided the bacterium with a favorite habitat forming a potential source of infection. The repeated shower over the same boxes with the infested rice straws gave the negligible effects on the population of the bacterium as well as the infection ratio.
日本植物病理学会の論文
1978-04-25

カンキツかいよう病菌Xanthomonas citri (Hasse) Dowsonの腐生的生存に関する研究 : 第III報腐生的生存菌の感染菌量について

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カンキツかいよう病菌Xanthomonas citri (Hasse) Dowsonの腐生的生存に関する研究 : 第III報 腐生的生存菌の感染菌量について

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カンキツかいよう病菌Xanthomonas citri (Hasse) Dowsonの腐生的生存に関する研究 : 第III報腐生的生存菌の感染菌量について