1987～1988年通过大蒜叶斑病病原菌的分离培养,测定其致病性等试验,证实了该病害系由病原真菌Cladosporium allii[Ellis＆Martin]所致.分生孢子发芽从寄主气孔侵入,并在寄主维管束周围定殖扩展,潜育期6天,接种后19天产生分生孢子梗及分生孢子. From 1987 to 1988, the pathogen of garlic leaf spot was isolated and cultured, and its pathogenicity was tested, it was confirmed that the disease was caused by the pathogenic fungus Cladosporium allii [Ellis & Martin] .The conidiospore invaded from the host stomata, Colonization and expansion around the vascular bundle, the incubation period of 6 days, 19 days after inoculation produce conidiophores and conidia.