摘要： 叶霉病[Fulviafulva（Cooke）Ciferri]是保护地番茄上的主要病害。对叶霉病菌生理小种及分化规律的研究，有助于了解该病原菌的分化组成情况，为抗病育种有针对性地合理选择使用抗源提供依据.1984~1990年以前，北京地区叶霉病菌以生理小种1.2和1.2.3为主.Cf4为免疫型抗病基因。1990年，侵染Cf4基因的生理小种群1.2.4，2.4和1.2.3.4出现，使含Cf4基因的双抗2号品种失去抗性.为对付新的生理小种，培育出含Cf₄Cf₅两个抗性基因的品种佳粉15号并被广泛用于保护地番茄生产。将1992年以来对叶霉病菌生理小种的监测结果与1990年相比，生理小种的致病性虽没有发生质变，但有少数菌株的致病性已有所增强，Cf₅基因不再表现免疫型抗性。培育含多个垂直抗病基因的品种，加强通风和适当药剂防治等都是减少病原菌菌量积累与小种分化，延长抗病品种使用寿命之有效措施。

关键词: 番茄, 叶霉病, 生理小种, 垂直抗性

Abstract: Leaf mould (Fulvia fulva Cooke Ciferri) is one of the serious diseases on tomato under protective cultivaion (greenhouse and plastic house) . In the program of tomato breeding for resistance to leaf mould, it is important to determine the extent of physiological races of leaf mould. Between 1984 and 1990, the races 1. 2 and 1. 2. 3 were found in Beijing. The gene Cf₄ was immune from those races. So a resistant variety (F1) Shuang Kang. 2 with Cf 4 was first introduced in tomato production. In 1990, that hybrid was attacked by the new races of 1. 2. 4, 2. 4 and 1. 2. 3. 4. Another hybrid Jia Fen. 15 with Cf₄ and Cf₅ was developed. It was resistant to the new races found in 1990. Although the six races had no obvious difference in virulence from those races in 1990, the virulence of a few isolations strengthened in a certain degree. The gene Cf₅ came to show no more immunity. Occassionally, a little amount of the mould could be found on the host plants with Cf₅. The breeders have to pay more attention to this matter.

Key words: Tomato, Leaf mould:Physiological race, Vertical resistance