１９９７年１０月和１９９８年９月在海南儋州市海南省种苗组培中心芦荟苗圃和华南热带农业大学农学院花圃发现芦荟疫病，感病芦荟叶片病斑初呈水渍状，暗绿色腐烂。从病组织上分离到１０个疫霉分离菌。根据孢子囊形态、孢子囊梗脱落性、厚垣孢子有无、藏卵器形态、雄器着生方式、菌落形态，最低、最高生长温度，将其鉴定为烟草疫霉（寄生疫霉） Ｐｈｙｔｏｐｈｔｈｏｒａ　ｎｉｃｏ－ｔｉａｎａｅ　 Ｖａｎ Ｂｒｅｄａ ｄｅ Ｈａａｎ．（Ｐ．ｐａｒａｓｉｔｉｃａ）。这１０个分离苗中存在Ａ１，Ａ２和Ａ１，Ａ２三种交配型。 In October 1997 and September 1998 in Hainan Pizhou seedling tissue culture center of aloe nursery and South China University of Tropical Agriculture College Nursery found aloe disease, susceptible aloe leaf lesions showed water-like, dark green rot . Isolates from the disease tissue to 10 Phytophthora isolated. Phytophthora (Phytophthora nicotianae) was identified according to the morphology of sporocysts, the sporulation of sporangia, the presence of chlamydospores, the morphology of the ovipositor, the manner of colonization, the shape of colonies, the minimum and maximum growth temperature. nico-tianae Van Breda de Haan. P. parasitica. There are three mating types A1, A2 and A1, A2 in these 10 seedlings.