西瓜感染病毒病后,全株呈系统花叶症状。发病初期,叶片上呈深浅相间的花叶,后形成疮斑或皱缩畸形,叶片窄小(小叶),轻病株尚可结瓜,但瓜小,无商品价值;发病重的结瓜少或不结瓜,植株萎缩,茎节变短,新生茎蔓纤细扭曲,花器发育不良,难以坐瓜。1病因 Watermelon infected with virus disease, the whole plant showed systemic mosaic symptoms. Early onset, the leaves were shades of flowers and leaves, after the formation of sores or shrinkage deformity, leaves narrow (leaf), light strains still knot melon, but melon small, no commercial value; Or not melon, plants shrink, shorten stems, stems slender new twists and turns, flower hypoplasia, it is difficult to sit melon. 1 etiology