Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2020, Vol. 36 ›› Issue (30): 112-119.doi: 10.11924/j.issn.1000-6850.casb20191000723

Special Issue: 马铃薯

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The Stem and Root Rot of Sweet Potato: Dispersal and Infection Path and Field Epidemic Factors

Yao Haifeng1(), Qiu Zhiling2, Shen Xiaoling3, Lou Binggan3, Gu Jianqiang1, Zhu Xiaoxiang1()   

  1. 1Hangzhou Lin’an Agricultural and Forestry Technology Extension Center, Hangzhou 311300
    2Hangzhou Lin’an Plant Quarantine Station, Hangzhou 311300
    3Zhejiang University, Hangzhou 310058
  • Received:2019-10-15 Revised:2019-11-13 Online:2020-10-25 Published:2020-10-16
  • Contact: Zhu Xiaoxiang E-mail:yhforveroo@163.com;zxx63738542@sohu.com

Abstract:

To understand the occurrence, epidemic regularity and impact factors of stem rot disease (SRD) of sweet potato in the main producing areas, such as Lin’an of Zhejiang Province, laboratory study, field experiments and investigation were carried out from 2016 to 2019 by using different varieties of sweet potato. Results showed that high susceptibility of major varieties was one of the main inducing factors for the SRD’s epidemic in recent years. The source of primary infection was the pathogen which overwintered in disease debris and tubers. Symptom did not appear until the quantity of pathogen in soil reached 104-105 cfu/cm3. High temperature and high humidity accelerated the development of SRD. The transportation of infected seed tubers and seedlings was the major way of long distance transmission and spread. SRD could be effectively decreased though pathogen-free seedlings, rotation, cultivation technique of deep furrow and high ridge.

Key words: the stem and root rot of sweet potato, sweet potato, main varieties, the dispersal path, epidemic factor

CLC Number: