1979年,在美国得克萨斯州发现了诱发高粱霜霉病(SDM)的病因——垂直病变型高粱指梗霜霉菌(Peronosclerospora sorghi)。按其在高粱自交系CS3541上诱发SDM系统侵染的能力,可分为P.sorghi病变型1和病变型2。 Jones(1970)曾报道,高粱接种P.sorghi分生孢子后4天叶片出现症状,接种后6天侵染叶片上形成孢子。其他研究者还发现,用分 In 1979, the cause of sorghum downy mildew (SDM) was induced in Texas, USA - Vertically pathogenic sorghum is referred to as Peronosclerospora sorghi. The ability to induce infection of SDM systems on sorghum inbred lines CS3541 can be divided into P. sorghi lesions 1 and 2. Jones (1970) reported that four days after the inoculation of P. sorghi conidia on sorghum, the leaves showed symptoms and infested leaves formed spores 6 days after inoculation. Other researchers also found that using points