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从采自平度、临沂两地的西瓜病叶中得到两个病毒分离物Ｗ—ＰＤ和Ｗ—ＬＹ。Ｗ—ＰＤ可侵染３科８种植物，可由桃蚜以非持久性方式传播。钝化温度６５℃，稀释限点１０￣（－４）～１０￣（－５），体外存活期２０～２５ｄ。提纯病毒呈典型的核蛋白吸收，最大吸收峰为２６０ｎｍ，最小吸收峰为２４６ｎｍ。Ａ２６０／Ａ２８０＝１．２４。病毒外壳蛋白分子量为３３．３４ＫＤ。Ｗ—ＰＤ的粒子线状，长度为６００～７５０ｎｍ。在病组织超薄切片中可以看到风轮状和环状内含体。Ｗ—ＰＤ与ＷＭＶ—２的抗血清有明显的沉淀反应。以上结果表明，Ｗ—ＰＤ为ＷＭＶ—２的一个分离物。Ｗ—ＬＹ可侵染５科１３种植物。钝化温度７０℃，稀释限点１０￣（－３）～１０￣（－４），体外存活期３～５ｄ，可由桃蚜以非持久方式传播，与ＣＭＶ的抗血清有明显的沉淀反应。Ｗ—ＬＹ应为ＣＭＶ的一个分离物。ＷＭＶ—２是我省西瓜病毒病的主要毒原，其分出率为７５％，ＣＭＶ的分出率为１６．３５％。
Two virus isolates W-PD and W-LY were obtained from leaves of watermelon collected from Pingdu and Linyi. W-PD can infect 8 families of 3 families, which can be disseminated by Myzus persicae in a non-persistent manner. Passivation temperature 65 ℃, dilution limit of 10 ~ (-4) ~ 10 ~ (-5), in vitro survival of 20 ~ 25d. Purified virus was typical nuclear protein absorption, the maximum absorption peak was 260nm, the minimum absorption peak was 246nm. A260 / A280 = 1.24. The viral coat protein has a molecular weight of 33.34 kD. W-PD particles linear, the length of 600 ~ 750nm. In the diseased tissue can be seen in the ultra-thin slices of the wind round and ring inclusions. W-PD and WMV-2 antiserum have significant precipitation reaction. The above results show that W-PD is an isolate of WMV-2. W-LY can infect 5 families and 13 species of plants. The passivation temperature was 70 ℃, the dilution limit was 10 ~ (-3) ~ 10 ~ (-4), and the survival time in vitro was 3 ~ 5 days. It could be disseminated by Myzus persicae in a non-sustained manner and had obvious precipitation reaction with CMV antiserum. W-LY should be an isolate of CMV. WMV-2 is the main toxin of watermelon virus in our province, with a separation rate of 75% and a CMV of 16.35%.