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在土壤中存活的病原菌,能凭借土壤水分的扩散作用而被动地移动,在试验室的条件下,最远可横向移动15厘米,在田间的自然条件下,可移动20厘米,但是在土壤下层的病原菌,不能向土面移动。在土壤中的病原菌,有可能被中耕除草,特别是培土起垄等栽培措施,将土壤中的病原菌,翻到土壤表面,直接接触或被雨水溅泼到寄主植株的下部叶片,在有水滴的情况下,侵入并形成数量较多的中心病株。据理推测:这种初侵染途径的可能性,是不容忽视的。
The pathogen that survives in the soil can move passively by virtue of the diffusion of soil moisture and can move up to 15 cm laterally under laboratory conditions and 20 cm under natural conditions in the field, Pathogenic bacteria, can not move to the soil surface. Pathogenic bacteria in the soil may be cultivated by weed farming, especially cultivating furrows and other cultivation measures. The soil pathogen will be turned over to the soil surface and be directly touched or splashed by rain onto the lower leaves of host plants. In case, invaded and formed a large number of center diseased strains. It is reasonable to speculate that the possibility of this initial infection can not be ignored.