soil rot

The pathogen ( Fusarium javanicum Koord) of the root rot of sweet potato survived about thirty-six months in the storage under the dry condition, and about thirty-one months in the soil of 10 cm depth.

甘薯根腐病主要致病菌（Fusarium javanicum Koord），在室内干贮条件下可存活36个月，在10厘米土层，可存活31个月。

Dead plants rot and become part of the soil again.

枯死的植物腐烂,又成为土壤的一部分.

The soil environment of planting soybean in the soils of the replication stubble and succession cropping stubble were unfavourable soybean's growing, because the pathogenic fungus and the other non-pathogenic fungus of the soybean root medium were a large numbers. And the soybean root rot occurred severely.

重茬和连茬土壤环境中，大豆根际土壤中致病菌数量大，杂菌多，是最不利于大豆生长的土壤环境，大豆根腐病发生加重。