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使用５份由西班牙提供的向日葵列当国际鉴别寄主，通过人工接种方法，对吉林省向日葵主产区３个点的向日葵列当群体进行了生理小种鉴定。结果表明．３个列当群体接种在向日葵列当国际鉴别寄主上反应完全一致，根据已知向日葵列当生理小种在鉴别寄主上的寄生性，该向日葵产区向日葵列当的生理小种定名为Ａ小种．
Five international identification hosts of sunflower seeds provided by Spain were used to identify the race of three sunflower populations in the main sunflower producing area of Jilin Province by artificial inoculation method. The results show. 3 columns when the group vaccination in the sunflower column when the international identification of the host reaction exactly the same, according to the known sunflower column when the physiological races on the identification of host parasitism, the sunflower production area sunflower column when the physiological races named A small Species.