西瓜病毒病主要是由黄瓜花叶病毒(CMV)和西瓜花叶病毒(WMV)侵染引起的。西瓜通常以成株期受病毒病危害最重,病株呈系统花叶症状,顶部叶片现浓淡相间的花叶,病叶变得窄小(即小叶)或皱缩畸形,发病较轻时,病株尚能结瓜,但瓜个小,发病重时结瓜少或不结瓜,植株萎缩,茎变短,新生茎蔓纤细扭曲,花器发育不良,难于坐瓜。1发病原因分析1)蚜虫传毒。西瓜生长期,田间易发生蚜虫,其 Watermelon virus disease is mainly caused by the infection of cucumber mosaic virus (CMV) and watermelon mosaic virus (WMV). Watermelon is usually hardest hit by virus disease at adult stage, the diseased plants show systemic mosaic symptoms, the top leaves are dark and white mosaic, the diseased leaves become narrow (ie, leaflets) or shrinkage deformity, the incidence of light, The diseased plants still can bear the melon, but the melons are small, the incidence of heavy fruiting or not, the plants shrink, the stems become shorter, the new stems and slender twigs, floral hypoplasia, it is difficult to sit melon. An analysis of the causes 1) aphids poisoning. Watermelon growing season, prone to aphids, its