ニホンナシ黒星病の第一次伝染源の種類と初発生における重要性

概要

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The significance of two kinds of Japanese pear scab infection sources, ascospores and conidia, in primary infection was investigated. Throughout three years experiments, the discharge of ascospores from pseudothecia produced on fallen leaves began from late March to early April, and finished in the end of May. Ascospores were first trapped at 10 to 22 days before the full blooming on cv. Kosui.Dispersion of conidia produced on lesions of scales and basal parts of flower clusters generally started in mid April and the number of dispersed conidia into the rain water tenderd to increase with the lapse of days. The germination ratio of these conidia was high. Scab occurrence on cv. Chojuro was light when trees were exposed to infection with conidia in the beginning of blooming but severe when infection occurred after the end of blooming. In the comparative experiments using two kinds of infection sources, the scab occurrence on leaves infected with ascospores was earlier and severer than those infected iwth conidia. From these results, it was concluded that ascospores were highly involved in the primary infection with Japanese pear scab.
日本植物病理学会の論文
1990-12-25