腐烂病菌Valsa Ceratosperma向苹果树侵入门户的冻伤部位、日烧部位及剪枝伤痕等,虽然已被明确。但是,关于这些部位病菌的动向,没有进行研究。本文对此试做说明。用器孢子向新鲜伤口接种,经10日后也未形成病斑。把切口用烧伤处理后再接种时,从处理后5日开始就能形成病斑。用苹果果实 (成熟前的果实)作试验也得到同样的结果。这时对这些伤口接种4日后(24℃)的器孢子的状态做了观察,看到剪枝的新伤口上孢子发芽少,且发芽管也短仅10毫微米左右,在10日后也未形成菌丝团。然而,经烧伤处 Valsa Ceratosperma, a rotting bacterium, has been clarified to frostbite sites, burned sites and pruning scars intrusion into apple trees. However, no research has been conducted on the germs of these organisms. This article describes this trial. Inoculated with spores fresh wounds, after 10 days also did not form a lesion. When the incision is treated with the burn and then inoculated, the lesion is formed from the 5th day after the treatment. The same result was obtained when the apple fruit (pre-mature fruit) was tested. At this time, the state of sporulation of the sporophytes on the 4th day after the wound inoculation (24 ° C) was observed. It was observed that spore germination was small on the newly cut wounds, and the sprouting tube was also shortened by only about 10 nm and was not formed after 10 days Mycelium. However, after burns