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对英国苜蓿黄萎病菌进行形态和生物学特性的研究结果表明，该病菌在ＰＤＡ培养基上分生孢子透明无色，孢子梗基部为黑褐色，后期有黑色休眠菌丝产生，未发现微菌核和厚垣孢子，证实为黑白轮枝菌（Ｖｅｒｔｉｃｉｌｉｕｍａｌｂｏ－ａｔｒｕｍＲｅｉｎｋｅ＆Ｂｅｒｔｈｏｌｄ），其生长适温为２０～２５℃，最适ｐＨ值为６．５～９．５。利用人工接菌法测定了对我国主要经济作物的致病性，在供试１２种作物中，对豌豆、番茄、西瓜、茄子、绿豆、豇豆和马铃薯具致病力，而对棉花、线椒、甜椒、向日葵、大豆无致病力。
The morphological and biological characteristics of Verticillium dahliae in the United Kingdom showed that the conidia were transparent and colorless in PDA medium, the base of sporoderm was dark brown and the latter was black dormant mycelium, Nucleus and chlamydospores were confirmed to be Verticiliumalbo-atrum Reinke & Berthold. The growth temperature was 20-25 ℃ and the optimum pH was 6.5-9.5. The pathogenicity of main crops was tested by artificial inoculation method. Among 12 crops tested, the pathogenicity of pea, tomato, watermelon, eggplant, mung bean, cowpea and potato was tested. , Bell pepper, sunflower, soy no pathogenicity.