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将我国、韩国、日本及俄罗斯远东地区的ＳＭＶ株系与鉴别寄主交互接种测定其毒力。结果指出采用外国的株系鉴别寄主难以区分我国株系毒力。同样，用我国鉴别寄主也难以区分外国毒株的毒力，所测定的我国９个株系的１３个代表毒株全部能侵染最抗病的鉴别寄主韩国的Ｂｕｆａｌｏ和日本的Ｈａｒｏｊｏｙ。外国鉴别寄主中只有少数对中国株系有鉴别作用，如韩国的Ｋｕａｎｇｇｙｏ能将Ｓ３与Ｓ１和Ｓ２区分，Ｄａｖｉｓ可将Ｓ１与其它株系区分。日本的タチユタカ等可将Ｓ３的多数株系与Ｓ１和Ｓ２区分，トモユタカ可区分Ｓ１与其它株系。韩国的强株系Ｇ７、及Ｋ１、Ｋ２和日本的中强株系ＳＭＶ－Ｂ的毒力，只相当于我国最弱的株系Ｓ１。因此很难找出各国株系之间的对应关系。我们认为用亲缘关系较远的外国鉴别寄主鉴定我国的株系是不适合和不必要的，而采用本国当前的主栽品种作株系鉴别寄主更有应用价值。
The virulence of SMV strains in China, South Korea, Japan and Russia’s Far East were tested by their interaction with the identification host. The results indicate that it is difficult to distinguish virulence strains of our country by foreign host identification host. Similarly, it is difficult to distinguish the virulence of foreign strains by the identification host in China. All the 13 representative strains of 9 strains in our country were found to be able to infect Bufalo, the most susceptible host in South Korea, and Harojoy, Japan. Only a few foreign identification hosts discriminate between Chinese strains. For example, Kuanggyo in Korea can distinguish S3 from S1 and S2, and Davis can distinguish S1 from other strains. Most of the strains of S3 can be distinguished from S1 and S2 by Japan’s Tate Yutaka etc., and Tetu-Hatta can distinguish S1 from other strains. The virulence of the strong line G7 in South Korea, and the strong line K1, K2 in Japan and SMV-B in Japan is only equivalent to the weakest line S1 in China. It is therefore difficult to find the correspondence between strains of countries. In our opinion, it is not suitable and unnecessary to identify the Chinese strains with distantly related foreign hosts, and it is more valuable to identify the host by using the current main cultivars in our country.