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journal1 ›› 2017, Vol. 33 ›› Issue (4): 519-524.DOI: 10.16409/j.cnki.2095-039x.2017.04.012

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Synergistic Efficacy of BABA and Hrp-mutant of Ralstonia solanacearum against Pepper Blight

YANG Yuhong, MAO Zhenchuan, LING Jian, XIE Bingyan   

  1. Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, China
  • Received:2017-04-07 Online:2017-08-08 Published:2017-08-11

Abstract: The synergistic efficacy and application technique of the mixture of β-aminobutyric acid (BABA) and avirulent hrp-mutant of Ralstonia solanacearum against pepper blight with different proportion were determined. The results showed that pretreatment of the combined use of BABA and hrp-mutant before inoculation obviously increased the control effects on pepper blight compared with single agent. Among six combinations of BABA and hrp-mutant, pretreatment with 0.08% BABA+hrp-strain 1×107cfu/mL, 0.1% BABA+hrp-strain 1×106 cfu/mL, or 0.1% BABA+hrp-strain 1×105 cfu/mL displayed the increase of control effect over 80%, and enhanced the synergy over 23%, compared with the single treatment with BABA. Moreover, pretreatment with the combined with 0.1% BABA+hrp-strain 1×106 cfu/mL showed the best efficacy with the synergy of 43%. The control effect and duration of the efficacy against pepper blight were further improved by increasing the frequency of application treatment. This work explored a new way for revealing the coordination application of multiple biocontrol measures.

Key words: FPhytophthora capsici, biological control, β-aminobutyric acid, avirulent hrp-mutant, synergistic interaction

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