Phytophthora meadii这种疫霉菌能使胶树发生条溃疡、嫩枝回枯、季风性落叶病和果腐病等严重病害。据报道,它也能引起胶苗根腐。季风性落叶病在天气潮湿或长期阴霾而温度又适于病菌繁殖的时期流行。因此,要掌握橡胶季风性落叶病发生流行的规律,必须认真研究病菌繁殖所需要的环境条件。本文摘要报道在实验室和大田研究病菌在胶树各种器官上的生长情况的结果。 Phytophthora meadii This Phytophthora sojae can cause ulcers in the gum tree, dead shoots, monsoon deciduous diseases and fruit rot and other serious diseases. It has also been reported that it can also cause root rot of the gel. Monsoon deciduous disease is prevalent in periods of humid or long-hazy weather and the prevalence of germs. Therefore, to grasp the prevalence of the occurrence of rubber monsoon deciduous disease, we must carefully study the environmental conditions necessary for the propagation of germs. This article presents the results of studies on the growth of germs in various organs of gum trees in laboratories and fields.