Effects of inoculum density of R. solani AG 2-2IIIB and age of plant on root rot severity in sugar beet
Root rot of sugar beet (Beta vulgaris L.), caused by Rhizoctonia solani anastomosis group AG 2-2 IIIB is responsible for significant crop losses in North Dakota and Minnesota, USA. Understanding the association between plant age and inoculum density with disease severity of sugar beet cultivars is...
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Polish Academy of Sciences
2025-03-01
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| Series: | Journal of Plant Protection Research |
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| Online Access: | https://journals.pan.pl/Content/134611/PDF/09_OA_JPPR_65_1_2068_Bhuiyan.pdf |
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| author | M.Z.R. Bhuiyan Luis Del Río Mendoza Dilip K. Lakshman Aiming Qi M.F.R. Khan |
| author_facet | M.Z.R. Bhuiyan Luis Del Río Mendoza Dilip K. Lakshman Aiming Qi M.F.R. Khan |
| author_sort | M.Z.R. Bhuiyan |
| collection | DOAJ |
| description | Root rot of sugar beet (Beta vulgaris L.), caused by Rhizoctonia solani anastomosis group AG 2-2 IIIB is responsible for significant crop losses in North Dakota and Minnesota, USA. Understanding the association between plant age and inoculum density with disease severity of sugar beet cultivars is a prerequisite to properly screen for varietal resistance. Therefore, investigations were conducted to determine the responses of 4-, 6-, and 8-week-old plants in seven commercial sugar beet cultivars to inoculum densities of one, two, and three grains of R. solani-colonized barley in a greenhouse and with three corresponding levels of colonized barley, mycelial plugs, and sclerotia in field experiments. Under greenhouse conditions, disease severity was greatest before plants reached six weeks of age (p = 0.05). There was a positive linear relationship between the density of the inoculum and disease severity. All seven cultivars were equally susceptible (p > 0.05) to R. solani. Interactions between cultivars and plant age and between plant age and intensity of inoculum were not significant (p > 0.05). Field experiments showed that the density of inoculums was significant (p < 0.001), and the disease severity was highest in plants inoculated with three colonized barley seeds per plant compared to doses of other inoculum types. |
| format | Article |
| id | doaj-art-dd324e091c7344cdaa22e242409c81b6 |
| institution | OA Journals |
| issn | 1427-4345 1899-007X |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Polish Academy of Sciences |
| record_format | Article |
| series | Journal of Plant Protection Research |
| spelling | doaj-art-dd324e091c7344cdaa22e242409c81b62025-08-20T01:56:28ZengPolish Academy of SciencesJournal of Plant Protection Research1427-43451899-007X2025-03-01vol. 65No 1https://doi.org/10.24425/jppr.2025.153824Effects of inoculum density of R. solani AG 2-2IIIB and age of plant on root rot severity in sugar beetM.Z.R. Bhuiyan0https://orcid.org/0000-0002-6995-3518Luis Del Río Mendoza1Dilip K. Lakshman2https://orcid.org/0000-0002-7454-8605Aiming Qi3M.F.R. Khan4Department of Plant Pathology, North Dakota State University, Fargo, North Dakota, USADepartment of Plant Pathology, North Dakota State University, Fargo, North Dakota, USAMolecular Plant Pathology Laboratory, USDA-ARS, Beltsville, Maryland, USASchool of Life and Medical Sciences, University of Hertfordshire, Hatfield, Haltfield, UKDepartment of Plant Pathology, North Dakota State University, Fargo, North Dakota, USARoot rot of sugar beet (Beta vulgaris L.), caused by Rhizoctonia solani anastomosis group AG 2-2 IIIB is responsible for significant crop losses in North Dakota and Minnesota, USA. Understanding the association between plant age and inoculum density with disease severity of sugar beet cultivars is a prerequisite to properly screen for varietal resistance. Therefore, investigations were conducted to determine the responses of 4-, 6-, and 8-week-old plants in seven commercial sugar beet cultivars to inoculum densities of one, two, and three grains of R. solani-colonized barley in a greenhouse and with three corresponding levels of colonized barley, mycelial plugs, and sclerotia in field experiments. Under greenhouse conditions, disease severity was greatest before plants reached six weeks of age (p = 0.05). There was a positive linear relationship between the density of the inoculum and disease severity. All seven cultivars were equally susceptible (p > 0.05) to R. solani. Interactions between cultivars and plant age and between plant age and intensity of inoculum were not significant (p > 0.05). Field experiments showed that the density of inoculums was significant (p < 0.001), and the disease severity was highest in plants inoculated with three colonized barley seeds per plant compared to doses of other inoculum types.https://journals.pan.pl/Content/134611/PDF/09_OA_JPPR_65_1_2068_Bhuiyan.pdfcultivar resistanceinoculum potentialsclerotiasoilborne pathogen |
| spellingShingle | M.Z.R. Bhuiyan Luis Del Río Mendoza Dilip K. Lakshman Aiming Qi M.F.R. Khan Effects of inoculum density of R. solani AG 2-2IIIB and age of plant on root rot severity in sugar beet Journal of Plant Protection Research cultivar resistance inoculum potential sclerotia soilborne pathogen |
| title | Effects of inoculum density of R. solani AG 2-2IIIB and age of plant on root rot severity in sugar beet |
| title_full | Effects of inoculum density of R. solani AG 2-2IIIB and age of plant on root rot severity in sugar beet |
| title_fullStr | Effects of inoculum density of R. solani AG 2-2IIIB and age of plant on root rot severity in sugar beet |
| title_full_unstemmed | Effects of inoculum density of R. solani AG 2-2IIIB and age of plant on root rot severity in sugar beet |
| title_short | Effects of inoculum density of R. solani AG 2-2IIIB and age of plant on root rot severity in sugar beet |
| title_sort | effects of inoculum density of r solani ag 2 2iiib and age of plant on root rot severity in sugar beet |
| topic | cultivar resistance inoculum potential sclerotia soilborne pathogen |
| url | https://journals.pan.pl/Content/134611/PDF/09_OA_JPPR_65_1_2068_Bhuiyan.pdf |
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