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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。生长发育温度14—36℃,以25—28℃最适;在pH5—9范围内均可生长,以pH6.5—7.5为最适。湿热致死温度,分生孢子为52℃,10分钟;厚垣孢子为54℃,10分钟。在干热72℃下,分生孢子经12小时死尽;厚垣孢子18小时死尽。重病地区病菌多存在于0—20厘米的耕作层内,但100—110厘米的土层仍有少量存在。据此,可采用三年轮作、温水52—54℃下10分钟浸种薯和深翻改土等防治措施。
The main pathogen of Fusarium javanicum Koord could survive for 36 months in indoor dry storage and 31 months in 10 cm soil layer. Growth and development temperature 14-36 ℃, 25-28 ℃ optimum; in the range of pH5-9 can grow to pH6.5-7.5 for the most appropriate. Wet heat lethal temperature, conidia 52 ℃, 10 minutes; Chlamydospores 54 ℃, 10 minutes. In dry heat at 72 ℃, conidia died after 12 hours; Chlamydospores died within 18 hours. Most endemic areas are found in 0-20 cm tillage, but 100-110 cm soil is still present in small quantities. Accordingly, three-year rotation can be used, warm water 52-54 ° C for 10 minutes soaking potatoes and deep soil improvement and other control measures.