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Chinese Journal Of Biological Control ›› 2019, Vol. 35 ›› Issue (4): 648-654.DOI: 10.16409/j.cnki.2095-039x.2019.04.022

• SCIENTIFIC NOTES • Previous Articles     Next Articles

Screening of Biocontrol Bacteria on Rice Bacteria Leaf Streak and Determination of Field Control Efficacy

WANG Xing1, YANG Jun1, CAO Weihua1, WEI Lanfang2, JI Guanghai1   

  1. 1. Key Laboratory of Agriculture Biodiversity for Plant Disease Management, the Ministry of Education/Yunnan Agricultural University, Kunming 650201, China;
    2. Agricultural Foundation Experiment Teaching Center, Yunnan Agricultural University, Kunming 650201, China
  • Received:2018-10-10 Online:2019-08-08 Published:2019-08-10

Abstract: In order to screen better biocontrol bacteria against rice bacteria leaf streak (BLS) caused by Xanthomonas oryzae pv.oryzicola, the biocontrol efficacy of four biocontrol bacteria strains on rice bacteria leaf streak were evaluated by plate confrontation test, greenhouse and field experiments. In the plate confrontation test, the antibacterial activities of the four biocontrol bacteria strains were determined. Greenhouse experiment showed that except for biocontrol strain LH, the plant height, root length and fresh weight of the rice seedlings treated with the other three biocontrol bacteria fermentation broths were significantly higher than those of the control. Inoculation test indicated that application of biocontrol bacteria before inoculation of pathogenic X. oryzae had the best control effect. Field trials demonstrated that the biocontrol strain L1 achieved more than 55% control efficacy in three different fields, and the yield increase rate was more than 10%, which was significantly higher than other treatments. This study shows that the biocontrol strain L1 can not only be used for the biological control of the BLS disease, but also promote rice growth, thus it has a good potential application.

Key words: rice bacteria leaf streak, biocontrol bacteria, plant growth promotion, biological control

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