Studies on Control Efficacy and Growth-Promotion Effect of Three Antagonistic Microbial Strains on Clubroot of Brassica oleracea

doi:10.16409/j.cnki.2095-039x.2020.03.017

Abstract

Abstract: Streptomyces longissimuss SL01, Paecilomyces lilacinus QLP12 and non-pathogenic Fusarium oxysporum Fo47 are biocontrol strains with significant disease control s and growth- promotion effects on plants. In order to clarify the control efficacy of the three strains on cabbage clubroot and growth-promoting effect on cabbage, the optimum seed-treating concentrations of the three strains were determined by seed germination test and cabbage seedling growth test. Geenhouse experiment showed that root irrigation with the three stains could effectively improve control efficiency on cabbage clubroot. The control efficacies of Fo47 and QLP12 could reach 90.38%, significantly higher than that of chemical treatment, and the control efficacy of QLP12 was 69.78%, significantly higher than that of water treatment. Field trials indicated that Fo47, QLP12 and SL01 all had good biocontrol effects, with the efficacies of 66.17%, 60.20% and 51.58%, respectively, and the increase rates of cabbage fresh weight of 29.13%, 43.69% and 16.5%, respectively. Quality test demonstrated that all the three strains could increase the reducing sugar content in leaves, and Fo47 and SL01 could also reduce the nitrate content in leaves. The above results showed that the three biocontrol strains can not only promote cabbage growth, improve the quality of leaves, but also had good control effect on cabbage clubroot, which provided a theoretical basis for the development and utilization of biofertilizer.

Key words: clubroot of Brassica oleracea, biological control, growth promotion, quality

CLC Number:

S476

JIA Ruimin, HU Lifang, WANG Tongtong, MA Qing, WANG Yang. Studies on Control Efficacy and Growth-Promotion Effect of Three Antagonistic Microbial Strains on Clubroot of Brassica oleracea[J]. Chinese Journal Of Biological Control, 2020, 36(3): 405-413.

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