Plant and Soil

, Volume 366, Issue 1–2, pp 453–466 | Cite as

Evaluation of rhizosphere bacteria and derived bio-organic fertilizers as potential biocontrol agents against bacterial wilt (Ralstonia solanacearum) of potato

Regular Article



Potato bacterial wilt (Ralstonia solanacearum) is a soil-borne disease that affects the potato plant (Solanum tuberosum) worldwide and causes serious economic losses in southern China. The objective of this study is to study the effect of bacterial antagonists and bio-organic fertilizers on potato bacterial wilt and rhizosphere soil microbial population.


In the present study, pot and field experiments were conducted to evaluate the LH23 (Bacillus amyloliquefaciens) and LH36 (Bacillus subtilis) strains and their derived bio-organic fertilizers (BIO23 and BIO36) as potential biocontrol agents against potato bacterial wilt.


BIO23 and BIO36 decreased the incidence of bacterial wilt disease and increased potato yields. In pot experiments, the disease incidence of BIO23 and BIO36 was 8.9 % and 11.1 % respectively, much lower than the control (57.7 %). The biocontrol efficiency of BIO23 was 84.6 %, which was the most successful treatment and BIO36 was the second with a biocontrol efficiency of 80.8 %. The increased percentages of potato yields when compared with the control were 63.5 % (BIO23), 64.7 % (BIO36) 34.8 % (LH23), 33.6 % (LH36) and 20.7 % (OF). The counts of antagonists, bacteria and actinobacteria in the rhizosphere soil were significantly increased in BIO23 and BIO36 treatments, whereas the counts of R. solanacearum and fungi in the soil in the both treatments decreased. In field experiments, 70 days after treatment, the biocontrol efficacies of BIO23 and BIO36 treatments were 92.0 % and 84.0 %, and the yield increases of BIO23 and BIO36 treatments were 42.3 % and 28.8 %, respectively, when compared with the organic fertilizer treatment. In addition, the changes in the microbial populations were the same as those observed in the greenhouse experiment.


Potato bacterial wilt could be well controlled by the application bio-organic fertilizer containing a specific antagonist, mainly through the alternation of soil microbial community


Bacterial wilt Potato Rhizosphere bacteria Bio-organic fertilizers Biocontrol 



This study was financially supported by the 111 project (B12009), and by the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions.


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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Chuanyu Ding
    • 1
  • Qirong Shen
    • 1
  • Ruifu Zhang
    • 1
  • Wei Chen
    • 1
  1. 1.Jiangsu Provincial Key Lab of Organic Solid Waste UtilizationNanjing Agricultural UniversityNanjingChina

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