西瓜、甜瓜病毒病的症状有斑驳、花叶、皱缩、多样型４类，其发生始期甜瓜为５月底６月初，西瓜较甜瓜偏晚１０ｄ左右；危害特点是早播瓜、单种瓜、覆膜瓜、相邻油菜和番茄地的瓜及同一瓜田四边受害严重；基本明确了主要传毒蚜虫的危害周期和转主传毒循环；其流行的主要因素是有较大群体的传毒蚜虫和以油菜病毒为主要毒源之一的充足毒源。 Watermelon, melon virus disease symptoms mottled, mosaic, shrunken, multi-type 4, the beginning of the occurrence of melon for the end of May early June, late melon late melon watermelon about 10d; Harm is characterized by early seeding melon, Melon, adjacent to the rape and tomato melon and the same melon fields were severely damaged; basically clear the main poisoning aphids harm cycle and the main transfer cycle; the main factor is the prevalence of a large group of aphids And to rape virus as one of the main source of adequate toxic sources.