Almquist C. (2016): Monitoring important soil-borne plant pathogens in Swedish crop production using real-time PCR. [PhD Thesis]. Upsala, Swedish University of Agricultural Sciences: 78. CABI (2019): Invasive Species Compendium. Datasheet: Plasmodiophora brassicae (club root). Available at https://www.cabi.org/isc/datasheet/41865 (accesed March 28, 2019). Cao T., Rennie D.C., Manolii V.P., Hwang S.F., Falak I., Strelkov S.E. (2014): Quantifying re-sistance to Plasmodiophora brassicae in Brassica hosts. Plant Pathology, 63: 715–726. https://doi.org/10.1111/ppa.12113 Castlebury, L.A., Maddox J.V., Glawe D.A. (1994): A technique for the extraction and purifica-tion of viable Plasmodiophora brassicae resting spores from host root tissue. Mycologia, 86: 458–460.  https://doi.org/10.1080/00275514.1994.12026435 Dixon G.R., Page L.V. (1998): Calcium and nitrogen eliciting alterations to growth and repro-duction of Plasmodiophora brassicae (clubroot). Acta Horticulturae, 459: 343–349. https://doi.org/10.17660/ActaHortic.1998.459.40 Dixon G.R. (2009): The occurrence and economic impact of Plasmodiophora brassicae and clubroot disease. Journal of Plant Growth Regulation, 28: 194–202. https://doi.org/10.1007/s00344-009-9090-y Donald C., Lawrence J.M., Porter I. (2004): Influence of particle size and application method on the efficacy of calcium cyanamide for control of clubroot of vegetable brassicas. Crop Protec-tion, 23: 297–303. https://doi.org/10.1016/j.cropro.2003.08.016 Donald C., Porter I. (2009): Integrated control of clubroot. Journal of Plant Growth Regulation, 28: 289–303. https://doi.org/10.1007/s00344-009-9094-7 Einhorn G., Bochow H., Huber J., Krebs B. (1991): Methodological studies on the detection of antagonists of the clubroot pathogen Plasmodiophora brassicae Wor. Archive für Phytopa-thologie und Pflanzenschutz, 27: 205–208. https://doi.org/10.1080/03235409109439070 Faggian R., Strelkov S.E. (2009): Detection and measurement of Plasmodiophora brassicae. Journal of Plant Growth Regulation, 28: 282–288. https://doi.org/10.1007/s00344-009-9092-9 Gao Y., Xu, G. (2014): Development of an effective nonchemical method against Plasmodiopho-ra brassicae on Chinese cabbage. International Journal of Agronomy, 2014: 1–5. https://doi.org/10.1155/2014/307367 Guetsky R., Shtienberg D., Elad Y., Fischer E., Dinoor A. (2002): Improving biological control by combining biocontrol agents each with several mechanisms of disease suppression. Phyto-pathology, 92: 976–985. https://doi.org/10.1094/PHYTO.2002.92.9.976 Handelsman J., Stabb E.V. (1996): Biocontrol of soilborne plant pathogens. The Plant Cell, 8: 1855–1869.  https://doi.org/10.2307/3870235 He P., Cui W., Munir S., He P., Li X., Wu Y., Yang X., Tang P., He Y. (2019): Plasmodiophora brassicae root hair interaction and control by Bacillus subtilis XF-1 in Chinese cabbage. Biologi-cal Control, 28: 56–63. Hwang S., Strelkov S.E., Feng J., Gossen B. D., Howard R.J. (2012): Plasmodiophora brassicae: a review of an emerging pathogen of the Canadian canola (Brassica napus) crop. Molecular Plant Pathology, 13: 105–113. https://doi.org/10.1111/j.1364-3703.2011.00729.x Kuginuki Y., Hiroaki Y., Hirai M. (1999): Variation in virulence of Plasmodiophora brassicae in Japan tested with clubroot-resistant cultivars of Chinese cabbage (Brassica rapa L. spp. pe-kinensis). European Journal of Plant Pathology, 105: 327–332. https://doi.org/10.1023/A:1008705413127 Kumar S. (2012): Biopesticides: a need for food and environmental safety. Journal of Biofertilizers and Biopesticides, 3: e107. doi: 10.4172/2155-6202.1000e107 https://doi.org/10.4172/2155-6202.1000e107 Kurowski T.P., Majchrzak B., Kowalska E. (2009): The effectiveness of the biological control of clubroot (Plasmodiophora brassicae) in Brassicaceae plants. Phytopathologia, 52: 5–12. Lahlali R., Peng G., Gossen B.D., McGregor L., Yu F.Q., Hynes R.K., Hwang S.F., McDonald M.R., Boyetchko S.M. (2013): Evidence that the biofungicide Serenade (Bacillus subtilis) sup-presses clubroot on canola via antibiosis and induced host resistance. Phytopathology, 103: 245–254. https://doi.org/10.1094/PHYTO-06-12-0123-R Lengai G., Muthomi J. (2018): Biopesticides and their role in sustainable agricultural production. Journal of Biosciences and Medicines, 6: 7–41. https://doi.org/10.4236/jbm.2018.66002 Mehnaz S. (2013): Secondary metabolites of Pseudomonas aurantiaca and their role in plant growth promotion. In: Arora N.K. (ed.): Plant Microbe Symbiosis: Fundamentals and Advances. New Delhi, Springer: 373–393. O'Brien P. (2017): Biological control of plant diseases. Australasian Plant Pathology, 46: 293–304. https://doi.org/10.1007/s13313-017-0481-4 Pal K.K., McSpadden Gardener B. (2006): Biological control of plant pathogens. The Plant Health Instructor. doi: 10.1094/PHI-A-2006-1117-02 https://doi.org/10.1094/PHI-A-2006-1117-02 Panda A.K , Bisht S.S., DeMondal S., Senthil Kumar N., Gurusubramanian G., Panigrahi A.K. (2014): Brevibacillus as a biological tool: a short review. Antonie Van Leeuwenhoek, 105: 623–639. https://doi.org/10.1007/s10482-013-0099-7 Peng G., Lahlali R., Hwang S.F., Pageau D., Hynes R.K., Mc-Donald M.R., Gossen B.D., Strelkov S.E. (2014): Crop rotation, cultivar resistance, and fungicides/biofungicides for managing clubroot (Plasmodiophora brassicae) on canola. Canadian Journal of Plant Patholo-gy, 36: 99–112. https://doi.org/10.1080/07060661.2013.860398 Rennie D.C, Manolii V.P., Cao T., Hwang S.F., Howard R.J., Strelkov S.E. (2011): Direct evi-dence of surface infestation of seeds and tubers by Plasmodiophora brassicae and quantification of spore load. Plant Pathology, 60: 811–819. https://doi.org/10.1111/j.1365-3059.2011.02449.x Říčařová V., Kazda J., Singh K., Ryšánek P. (2016): Clubroot caused by Plasmodiophora brassi-cae Wor.: a review of emerging serious disease of oilseed rape in the Czech Republic. Plant Pro-tection Science, 52: 71–86. https://doi.org/10.17221/87/2015-PPS Ruijter J.M., Ramakers C., Hoogaars W.M. H., Karlen Y., Bakker O., van den Hoff M.J.B., Moorman A.F.M. (2009): Amplification efficiency: linking baseline and bias in the analysis of quantitative PCR data. Nucleic Acids Research, 37: e45. doi: 10.1093/nar/gkp045 https://doi.org/10.1093/nar/gkp045 SCANDAGRA (2019): BactoMix 5. Available at https://https://scandagra.ee/tooted/bactomix-5/ (accessed March 20, 2019). Singh H.B. (2014): Management of plant pathogens with microorganisms. Proceedings of the Indian National Science Academy, 2: 443–454. https://doi.org/10.16943/ptinsa/2014/v80i2/55120 Todero I., Confortin T.C., Luft L., Brun T., Ugalde G.A., de Almeida T.C., Arnemann J.A., Zabot G.L., Mazutti M.A. (2018): Formulation of a bioherbicide with metabolites from Phoma sp. Scientia Horticulturae, 241: 285–292. https://doi.org/10.1016/j.scienta.2018.07.009 Vinale F., Sivasithamparam K., Ghisalberti E., Marra R., Barbetti M.J., Li H., Woo S., Lorito M. (2008): A novel role for The Trichoderma–plant interaction Trichoderma secondary metabolites in the interactions with plants. Physiological and Molecular Plant Pathology, 72: 80–86. https://doi.org/10.1016/j.pmpp.2008.05.005 Walker R., Powell A.A., Seddon B. (1998): Bacillus isolates from the spermosphere of peas and dwarf French beans with antifungal activity against Botrytis cinerea and Pythium species. Journal of Applied Microbiology, 84: 794–801. https://doi.org/10.1046/j.1365-2672.1998.00411.x Wallenhammar A.C. (1996): Prevalence of Plasmodiophora brassicae in a spring oilseed rape growing area in central Sweden and factors influencing soil infestation levels. Plant Pathology, 45: 710–719. https://doi.org/10.1046/j.1365-3059.1996.d01-173.x Wallenhammar A., Almquist C., Söderström M., Jonsson A. (2012): In-field distribution of Plasmodiophora brassicae measured using quantitative real-time PCR. Plant Pathology, 61: 16–28. https://doi.org/10.1111/j.1365-3059.2011.02477.x Wallenhammar A.C., Gunnarson A., Hansson F., Jonsson A. (2016): Quantification of Plasmodiophora brassicae using a DNA-based soil test facilitates sustainable oilseed rape pro-duction. Plants (Basel), 5:21. doi: 10.3390/plants5020021 https://doi.org/10.3390/plants5020021 Xu X.-M., Jeffries P., Pautasso M., Jeger M.J. (2011): Combined use of biocontrol agents to manage plant diseases in theory and practice. Phytopathology, 101: 1024–1031. https://doi.org/10.1094/PHYTO-08-10-0216