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Huanglongbing (HLB) is a devastating and fastidious phloem-limited bacterial disease,with no known cure till now, causing substantial economic losses worldwide.In this study, we screened the efficacy of a new soil conditioner produced by Zaoqing South China Run-zhe-xin-ye Biotechnology Limited Liability Company on different aged citrus trees infected with Huanglongbing in 4 orchards situated in Sihui or Longmen of Guangdong province.