References
- Alberta Agriculture and Forestry. 2020. Alberta climate information service-prevailing wind direction. [accessed 2020 May 30]. https://agriculture.alberta.ca/acis/wind-rose.jsp
- Ayers GW. 1944. Studies on the life history of the club root organism,Plasmodiophora brassicae. Can J Res. 22c(4):143–149. doi:https://doi.org/10.1139/cjr44c-012.
- Barman D, Kundu DK, Pal S, Pal S, Chakraborty AK, Jha AK, Mazumdar SP, Saha R, Bhattacharyya P. 2017. Soil temperature prediction from air temperature for alluvial soils in lower Indo-Gangetic plain. Int Agrophysics. 31(1):9–22. doi:https://doi.org/10.1515/intag-2016-0034.
- Barton K 2020. MuMIn: multi-model inference. [accessed 2021 May 5]. https://CRAN.R-project.org/package=MuMIn
- Buczacki ST, Moxham SE. 1983. Structure of the resting spore wall of Plasmodiophora brassicae revealed by electron microscopy and chemical digestion. Trans Br Mycol Soc. 81(2):221–231. doi:https://doi.org/10.1016/S0007-1536(83)80073-4.
- Buczacki ST, Toxopeus H, Mattusch P, Johnston TD, Dixon GR, Hobolth LA. 1975. Study of physiologic specialization in Plasmodiophora brassicae: proposals for attempted rationalization through an international approach. Trans Br Mycol Soc. 65(2):295–303. doi:https://doi.org/10.1016/S0007-1536(75)80013-1.
- Canola council of Canada. 2019. List of clubroot-resistant canola varieties | canola Watch. [accessed 2020 Jun 19]. https://www.canolawatch.org/2019/01/10/list-of-clubroot-resistant-canola-varieties/
- Cao T, Manolii VP, Zhou Q, Hwang S-F, Strelkov SE, Beres B. 2020. Effect of canola (Brassica napus) cultivar rotation onPlasmodiophora brassicaepathotype composition. Can J Plant Sci. 100(2):218–225. doi:https://doi.org/10.1139/cjps-2019-0126.
- Dixon GR. 2009. Plasmodiophora brassicae in its environment. J Plant Growth Regul. 28(3):212–228. doi:https://doi.org/10.1007/s00344-009-9098-3.
- Dobson R. 1982. Soil water matric potential requirements for root-hair and cortical infection of Chinese Cabbage byPlasmodiophora brassicae. Phytopathology. 72(12):1598–1600. doi:https://doi.org/10.1094/Phyto-72-1598.
- Donald E, Porter I 2003. Clubroot (Plasmodiophora brassicae) an imminent threat to the Australian canola industry. p. 114–118. [accessed 2017 Jun 4]. http://www.australianoilseeds.com/__data/assets/pdf_file/0015/4542/Clubroot_Plasmodiophora_brassicae_an_imminent_threat_to_canola.pdf
- Ernst TW, Kher S, Stanton D, Rennie DC, Hwang SF, Strelkov SE. 2019. Plasmodiophora brassicaeresting spore dynamics in clubroot resistant canola (Brassica napus) cropping systems. Plant Pathol. 68(2):399–408. doi:https://doi.org/10.1111/ppa.12949.
- Fredua-Agyeman R, Hwang S-F, Strelkov SE, Zhou Q, Feindel D. 2018. Potential loss of clubroot resistance genes from donor parentBrassica rapasubsp.rapifera(ECD 04) during doubled haploid production. Plant Pathol. 67(4):892–901. doi:https://doi.org/10.1111/ppa.12816.
- Froese RD, Derksen H, Guo X, McLaren DL. 2018. Monitoring and occurrence of clubroot in Manitoba in 2018. Can J Plant Pathol. 41(sup 1):179.
- Gossen BD, Adhikari KKC, McDonald MR. 2012. Effects of temperature on infection and subsequent development of clubroot under controlled conditions. Plant Pathol. 61(3):593–599. doi:https://doi.org/10.1111/j.1365-3059.2011.02536.x.
- Gossen BD, Kasinathan H, Cao T, Manolii VP, Strelkov SE, Hwang S-F, McDonald MR. 2013. Interaction of pH and temperature affect infection and symptom development ofPlasmodiophora brassicaein canola. Can J Plant Pathol. 35(3):294–303. doi:https://doi.org/10.1080/07060661.2013.804882.
- Hamilton H, Crête R. 1978. Influence of soil moisture, soil ph, and liming sources on the incidence of clubroot, the germination and growth of cabbage produced in mineral and organic soils under controlled conditions. Can J Plant Sci. 58(1):45–53. doi:https://doi.org/10.4141/cjps78-010.
- Harding MW, Hill TB, Yang Y, Daniels GC, Hwang SF, Strelkov SE, Howard RJ, Feng J. 2019. An improved evans blue staining method for consistent, accurate assessment ofPlasmodiophora brassicae resting spore viability. Plant Dis. 103(9):2330–2336. doi:https://doi.org/10.1094/PDIS-05-18-0855-RE.
- Hollman KB, Hwang SF, Manolii VP, and Strelkov SE. (2021). Pathotypes of Plasmodiophora brassicae collected from clubroot resistant canola (Brassica napus L.) cultivars in western Canada in 2017-2018. Can J Plant Pathol, 43(4), 622–630. https://doi.org/10.1080/07060661.2020.1851893
- Holtz MD, Hwang S-F, Strelkov SE. 2018. Genotyping of Plasmodiophora brassicae reveals the presence of distinct populations. BMC Genomics. 19(1):254. doi:https://doi.org/10.1186/s12864-018-4658-1.
- Horiuchi S, Hori M. 1980. Simple greenhouse technique for obtaining high levels of clubroot incidence. Hokoku Bull Chugoku Natl Agric Exp Stn Ser E Environ Div. [accessed 2021 Mar 29]. http://agris.fao.org/agris-search/search.do?recordID=US201302793903
- Hwang S-F, Howard RJ, Strelkov SE, Gossen BD, Peng G. 2014. Management of clubroot (Plasmodiophora brassicae) on canola (Brassica napus) in western Canada. Can J Plant Pathol. 36(sup1):49–65. doi:https://doi.org/10.1080/07060661.2013.863806.
- Hwang SF, Ahmed HU, Strelkov SE, Gossen BD, Turnbull GD, Peng G, Howard RJ. 2011a. Seedling age and inoculum density affect clubroot severity and seed yield in canola. Can J Plant Sci. 91(1):183–190. doi:https://doi.org/10.4141/cjps10066.
- Hwang SF, Ahmed HU, Zhou Q, Rashid A, Strelkov SE, Gossen BD, Peng G, Turnbull GD. 2013. Effect of susceptible and resistant canola plants onPlasmodiophora brassicaeresting spore populations in the soil. Plant Pathol. 62(2):404–412. doi:https://doi.org/10.1111/j.1365-3059.2012.02636.x.
- Hwang SF, Ahmed HU, Zhou Q, Strelkov SE, Gossen BD, Peng G, Turnbull GD. 2011b. Influence of cultivar resistance and inoculum density on root hair infection of canola (Brassica napus) by Plasmodiophora brassicae. Plant Pathol. 60(5):820–829. doi:https://doi.org/10.1111/j.1365-3059.2011.02457.x.
- Kageyama K, Asano T. 2009. Life cycle of Plasmodiophora brassicae. J Plant Growth Regul. 28(3):203. doi:https://doi.org/10.1007/s00344-009-9101-z.
- Lenth RV. 2016. Least-Squares Means: theRPackagelsmeans. J Stat Softw. 69(1):1–33. doi:https://doi.org/10.18637/jss.v069.i01.
- LMC International. 2016. The economic impact of canola on the Canadian economy. Winnipeg: Canola Council of Canada. [accessed 2020 May 19]. https://www.canolacouncil.org/markets-stats/industry-overview/
- Luo H, Chen G, Liu C, Huang Y, Xiao C. 2014. An improved culture solution technique for Plasmodiophora brassicae infection and the dynamic infection in the root hair. Australasian Plant Pathology. 43(1):53–60. doi:https://doi.org/10.1007/s13313-013-0240-0.
- McGrann GRD, Gladders P, Smith JA, Burnett F. 2016. Control of clubroot (Plasmodiophora brassicae) in oilseed rape using varietal resistance and soil amendments. Field Crops Res. 186:146–156. [accessed 2015 Dec 15]. http://www.sciencedirect.com/science/article/pii/S0378429015300964
- Pageau D, Lajeunesse J, Lafond J. 2006. [Plasmodiophora brassicae]. Can J Plant Pathol. 28(1):137–143. doi:https://doi.org/10.1080/07060660609507280.
- Peng G, Pageau D, Strelkov SE, Gossen BD, Hwang S-F, Lahlali R. 2015. A >2-year crop rotation reduces resting spores of Plasmodiophora brassicae in soil and the impact of clubroot on canola. Eur J Agron. 70:78–84. doi:https://doi.org/10.1016/j.eja.2015.07.007.
- Pinheiro J, Bates D, DebRoy S, Sarkar D, R Core Team. 2019. nlme: linear and nonlinear mixed effects models. [accessed 2020 May 19]https://CRAN.R-project.org/package=nlme
- R Core Team. 2019. R: a Language and Environment for Statistical Computing. Vienna (Austria): R Foundation for Statistical Computing. https://www.R-project.org/
- Rahman H, Peng G, Yu F, Falk KC, Kulkarni M, Selvaraj G. 2014. Genetics and breeding for clubroot resistance in Canadian spring canola (Brassica napusL.). Can J Plant Pathol. 36(sup1):122–134. doi:https://doi.org/10.1080/07060661.2013.862571.
- Rashid A, Ahmed HU, Xiao Q, Hwang SF, Strelkov SE. 2013. Effects of root exudates and pH on Plasmodiophora brassicae resting spore germination and infection of canola (Brassica napus L.) root hairs. Crop Protection. 48:16–23. doi:https://doi.org/10.1016/j.cropro.2012.11.025.
- Rauschert E 2010. Survivorship Curves. [accessed 2021 Feb 10]. https://www.nature.com/scitable/knowledge/library/survivorship-curves-16349555/
- Rempel CB, Hutton SN, Jurke CJ. 2014. Clubroot and the importance of canola in Canada. Can J Plant Pathol. 36(sup1):19–26. doi:https://doi.org/10.1080/07060661.2013.864336.
- Ren L, Jia J, Li M, Liu F, Cheng Y, Zhang M, Chen K, Fang X. 2012. Distribution of rapeseed clubroot disease in Hubei province and evaluation of yield loss. Agric Sci Technol. 13(4):775–777.
- Rennie DC, Manolii VP, Cao T, Hwang SF, Howard RJ, Strelkov SE. 2011. Direct evidence of surface infestation of seeds and tubers by Plasmodiophora brassicae and quantification of spore loads. Plant Pathol. 60(5):811–819. doi:https://doi.org/10.1111/j.1365-3059.2011.02449.x.
- Samuel G, Garrett SD. 1945. The infected root-hair count for estimating the activity of Plasmodiophora brassicae Woron. in the soil. Ann Appl Biol. 32(2):96–101. doi:https://doi.org/10.1111/j.1744-7348.1945.tb06767.x.
- Sharma K, Gossen BD, McDonald MR. 2011a. Effect of temperature on primary infection by Plasmodiophora brassicae and initiation of clubroot symptoms. Plant Pathol. 60(5):830–838. doi:https://doi.org/10.1111/j.1365-3059.2011.02458.x.
- Sharma K, Gossen BD, McDonald MR. 2011b. Effect of Temperature on Cortical Infection byPlasmodiophora brassicaeand Clubroot Severity. Phytopathology®. 101(12):1424–1432. doi:https://doi.org/10.1094/PHYTO-04-11-0124.
- Shtienberg D. 2000. Modelling: the basis for rational disease management. Crop Prot. 19(8–10):747–752. doi:https://doi.org/10.1016/S0261-2194(00)00099-5.
- Statistics Canada. 2020. Table 32- 10-0359-01Estimated areas, yield, production, average farm price and total farm value of principal field crops, in metric and imperial units. [accessed 2020 May 19] https://www150.statcan.gc.ca/t1/tbl1/en/cv.action?pid=3210035901
- Strehlow B, De Mol F, Struck C. 2015. Risk potential of clubroot disease on winter oilseed rape. Plant Dis. 99(5):667–675. doi:https://doi.org/10.1094/PDIS-05-14-0482-RE.
- Strelkov SE, Hwang S-F. 2014. Clubroot in the Canadian canola crop: 10 years into the outbreak. Can J Plant Pathol. 36(sup1):27–36. doi:https://doi.org/10.1080/07060661.2013.863807.
- Strelkov SE, Hwang S-F, Manolii VP, Cao T, Feindel D. 2016. Emergence of new virulence phenotypes of Plasmodiophora brassicae on canola (Brassica napus) in Alberta, Canada. Eur J Plant Pathol. 145(3):517–529. doi:https://doi.org/10.1007/s10658-016-0888-8.
- Strelkov SE, Hwang SF, Manolii VP, Cao T, Fredua-Agyeman R, Harding MW, Peng G, Gossen BD, McDonald MR, and Feindel D. 2018. Virulence and pathotype classification of Plasmodiophora brassicae populations collected from clubroot resistant canola (Brassica napus) in Canada Can J Plant Pathol. . 40(2):284–298.
- Strelkov SE, Manolii VP, Harding MW, Daniels GC, Nuffer T, Aigu Y, Hwang SF. 2020. The occurrence and spread of clubroot on canola in Alberta in 2019. Can J Plant Pathol. 42(sup1):117–120. doi:https://doi.org/10.1080/07060661.2020.1752524.
- Strelkov SE, Manolii VP, Harding MW, Hwang SF, Poscente N, Lisowski SLI, Pugh CA, Burke DA. 2014. The occurrence of clubroot on canola in Alberta in 2013. Can Plant Dis Surv. 94:155–159.
- Strelkov SE, Tewari JP, Smith-Degenhardt E. 2006. Characterization ofPlasmodiophora brassicaepopulations from Alberta, Canada. Can J Plant Pathol. 28(3):467–474. doi:https://doi.org/10.1080/07060660609507321.
- Tewari JP, Strelkov SE, Orchard D, Hartman M, Lange RM, Turkington TK. 2005. Identification of clubroot of crucifers on canola (Brassica napus) in Alberta. Can J Plant Pathol. 27(1):143–144. doi:https://doi.org/10.1080/07060660509507206.
- Thuma BA. 1983. Relationships of soil temperature and moisture to clubroot (Plasmodiophora brassicae) severity on radish in organic soil. Plant Dis. 67(7): 758. [accessed 2020 Jul 1]. https://www-apsnet-org.login.ezproxy.library.ualberta.ca/publications/PlantDisease/BackIssues/Documents/1983Articles/PlantDisease67n07_758.PDF
- 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 Pathol. 45(4):710–719. doi:https://doi.org/10.1046/j.1365-3059.1996.d01-173.x.
- Wallenhammar AC, Johnsson L, Gerhardson B. 2000. Agronomic performance of partly clubroot-resistant spring oilseed turnip rape lines. J Phytopathol. 148(7–8):495–499. doi:https://doi.org/10.1046/j.1439-0434.2000.00536.x.
- Wickham H, and Seidel D 2020. Scales: scale functions for visualization. https://CRAN.R-project.org/package=scales [accessed 2020 May 20]
- Zhang Y, Chen W, Smith SL, Riseborough DW, Cihlar J. 2005. Soil temperature in Canada during the twentieth century: complex responses to atmospheric climate change. J Geophys Res Atmospheres. 110(D3). doi:https://doi.org/10.1029/2004JD004910.
- Ziesman B, Avila R, Ursu K, Kwasnicki J, Roszell L, Baraniecki C, Johnson B, Fenning C, Makohoniuk K, Junek S, et al. 2018. 2018 Clubroot survey and known occurrence of clubroot in Saskatchewan. Can J Plant Pathol. 41(sup 1):179.