兰花叶上的焦斑,不仅减弱兰花长势,而且有碍观瞻。为此,我们于1979年对兰花叶上焦斑的种类、病原和防治作了一些试验观察,现总结如下: 一、焦斑的类型“焦斑”是各种斑点的统称,实际上各种兰花每张叶产生的焦斑不一样。据病原检查,各种类型病斑的病原大部分为炭疽菌,保湿培养时一部分为长筒孢属真菌。炭疽菌似有三种,分属于Colletotr- Orchid leaves on the focal spot, not only weakened the growth of orchids, but also obstruct the view. For this reason, we made some experimental observations on the types, pathogens and prevention of focal spots on orchids in 1979. The results are summarized as follows: First, the type of focal spot “focal spot” is a general term for various spots. In fact, Orchid each leaf produces different focal spot. According to pathogen check, most of the pathogen of various types of lesion is anthrax, part of which is Trichosporon fungi during moisturizing culture. There are three anthrax species, belonging to Colletotr-