农林作物在生长发育过程中,常会遭受各种各样病原微生物的侵害,使其产生各种各样的病害。危害作物的病原微生物有细菌、真菌、病毒、类菌体等,病原微生物危害方式多样,有的寄生在植物体表,有的潜入组织结构的内部,以植物细胞为营养,在植物体内完成自已的生长发育过程,再次侵染农林作物。 In the process of growth and development of agricultural and forestry crops, they often suffer from various pathogenic microorganisms and cause various diseases. Pathogenic microorganisms harmful to crops are bacteria, fungi, viruses, bacteria and other organisms, pathogenic microorganisms in a variety of ways, some parasitic in the plant surface, and some sneaked into the internal structure of the plant cells as nutrients in the body to complete their own The process of growth and development, again infected with agroforestry crops.