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1997年西瓜病毒病曾在陕西省局部瓜田发生严重,2000年、2001年又在本省的长安、临渭、大荔、澄县、华县、乾县、兴平、武功等地偏重发生,尤以长安发生最重。病田率80％～100％,平均病株率20％～30％,重者达80％以上。年发生面积超过0.7万hm2。发病轻者减产20％～30％,重病田块如果与枯萎病混合发生会导致绝收。由于瓜农普遍对蚜虫传毒的为害性和病毒病的发生规律缺乏足够的认识,不能及时、准确治蚜防病,往往错过了防治适期,造
In 1997, watermelon virus disease was severely affected in some melon fields in Shaanxi Province. In 2000 and 2001, it reoccurred heavily in Chang’an, Linwei, Dali, Chengxian, Huaxian, Ganxian, Xingping and Wugong in Shaanxi Province. In particular, In Changan the heaviest occurrence. Sickness rate of 80% to 100%, the average diseased plant rate of 20% to 30%, severe cases of more than 80%. Annual area of more than 7,000 hm2. Slightly reduce the incidence of 20% to 30%, serious disease if the field will be mixed with blight yield. As melon farmers generally aphid infestation poisoning and viral diseases lack of adequate understanding of the law, not timely and accurate cure aphids disease prevention, often missed the appropriate period of prevention and control,