植物病毒病广泛发生于粮油、蔬菜、果树等多种作物上,由于防治比较困难,其发生和危害,日益受到重视。植物病毒是一类只能在植物寄主内生存的寄生物。病毒个体微小,结构简单,绝大多数只由内部的核酸芯和外部的蛋白外壳组成;外形变化少,几百种植物病毒仅有杆状、线条状、球状等几种形态。由于这些特点,使病毒病的诊断和病原鉴定有其特有的技术方 Plant virus disease occurs in a wide range of crops, such as grain, oil, vegetables and fruit trees. Because of the more difficult control and its occurrence and harm, plant virus diseases are receiving more and more attention. Plant viruses are a type of parasite that can only survive in plant hosts. Viruses are small and simple in structure, and most of them consist of an internal nucleic acid core and an outer protein shell. There are few changes in appearance and several forms of plant virus are only rod-like, line-shaped and globular. Due to these characteristics, the diagnosis and identification of virus diseases have their own unique technical aspects