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松苗叶枯病是由真菌中的尾孢菌引起的病害。病菌以菌丝危害国外松的针叶,严重地影响生长发育。我所1974年引种的一批国外松,由于受叶枯病菌的侵染,虽经采取多种措施防治,仍有一个苗圃5个月生的加勒比松苗,死亡率达60%以上。为摸清叶枯病的发生规律,找出影响病害发生、发展的因子及其关系,以便今后更好地控制和防治叶枯病的发生,我们两年来做了一些调查,观察和防治试验,初步掌握了它的发生规律,找出一些防治方法,取得了一定效果。一、症状叶枯病菌以侵害针叶为主,初染病时基部叶先发生病斑,逐渐向上蔓延,针叶枯萎下垂但不脱落。受害针叶从尖端或中部发生一段段
Song Miao leaf blight is caused by fungus cercospores. Hyphae pathogenic bacteria to coniferous pine outside the world, seriously affecting the growth and development. A batch of foreign pine introduced by our institute in 1974, due to the infection by leaf blight, still has a carp pine seedling of 5 months of birth in a nursery with a mortality rate of over 60% despite various measures. In order to find out the regularity of the occurrence of leaf blight and identify the factors that affect the occurrence and development of the disease so as to better control and prevent the occurrence of leaf blight in the future, we conducted some surveys, observation and control experiments in the past two years, Preliminary grasp of the law of its occurrence, to find out some control methods, and achieved some results. First, the symptoms of leaf blight to attack conifers, the initial infection of the base of the first leaf spot disease, gradually spread upward, needle withered but not fall off. Victims of needles from the tip or the middle of a section occurred