在自然界中,植物的生长和发育需要有适当的条件,当植物受到其他生物的侵袭,或者不适当的环境条件超越了它们的适应范围,其正常的生长发育就会受到干扰和破坏,从而发生病变,严重者导致死亡。大多数植物病害是传染性的,是由人的肉眼不易看见的细小生物的侵染为害引起,通常表现为 In nature, the growth and development of plants need appropriate conditions. When plants are attacked by other organisms, or inappropriate environmental conditions exceed their range of adaptation, their normal growth and development may be disturbed and destroyed, resulting in occurrence Lesions, severe cases lead to death. Most plant diseases are contagious and are caused by the infestation of small organisms that are invisible to the naked eye,