植物病原细菌,在严峻的自然条件下,其独立生存的可能性,经查明是很小的,要依附于植物或土壤等才能生存。种子是病原细菌的依存物体,也可以说是病害传播途径的重要媒介之一。在细菌病害中,种子传染率一般在1％左右,这一比率虽然不是很高,但被病原细菌污染了的种子,在适宜的环境条件下长出的幼苗不但自身发病,而且也是其他健康植株的传染源,乃致造成全田病害大发生,也有的传播范围相当广泛(后藤,1981)。因此,对种传细菌病害要予以特别 Plant pathogenic bacteria, under severe natural conditions, the possibility of their independent existence, identified as very small, to attach to plants or soil to survive. Seeds are pathogenic bacteria dependent objects, it can be said that one of the important media of disease transmission. In bacterial diseases, the rate of seed infection is generally about 1%, although this ratio is not very high, but the seeds contaminated by pathogenic bacteria, seedlings grown under suitable environmental conditions not only their own disease, but also other healthy plants Of the source of infection is caused by the disease occurred in the whole field, but also a wide range of transmission (Goto, 1981). Therefore, the bacteria on the germ to be special