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Permanent link (DOI): https://doi.org/10.7939/R38W38F12

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FUSARIUM ROOT ROT OF SOYBEAN IN SOUTHERN ALBERTA: PATHOGEN AGGRESSIVENESS AND DISEASE MANAGEMENT Open Access

Descriptions

Other title
Subject/Keyword
Fusarium root rot
Soybean root rot Alberta
Soybean root rot
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Nyandoro, Ronald
Supervisor and department
Kan-Fa Chang (Alberta Agriculture and Forestry)
Stephen Strelkov (Agricultural, Food and Nutritional Science)
Examining committee member and department
Guillermo Hernandez Ramirez (Renwable Resources)
Kan-Fa Chang (Alberta Agriculture and Forestry)
Rudolph.Fredua-Agyeman (Alberta Agriculture and Forestry)
Stephen Strelkov (Agricultural, Food and Nutritional Science)
Department
Department of Agricultural, Food, and Nutritional Science
Specialization
Plant Science
Date accepted
2017-01-19T15:42:36Z
Graduation date
2017-06:Spring 2017
Degree
Master of Science
Degree level
Master's
Abstract
Fusarium root rot is a major disease of soybean (Glycine max) in many regions worldwide. As soybean is a relatively new crop in Alberta, Canada, studies were undertaken to determine the occurrence and severity of root rot in this province, identify and characterize the Fusarium species associated with disease development, and evaluate seed treatments and host resistance as disease management tools. Root rot was found in all soybean crops surveyed in 2013 and 2014. A total of seven species of Fusarium were identified from infected roots based on their morphological characteristics, with Fusarium avenaceum, F. solani, F. oxysporum, and F. acuminatum occurring most frequently. In greenhouse bioassays, isolates of F. proliferatum and F. acuminatum were the most aggressive, although some isolates of F. acuminatum caused little disease. Seed treatment with ipconazole + metalaxyl + fludioxonil, ipconazole + metalaxyl, fludioxonil + metalaxyl, or penflufen + prothioconazole + metalaxyl resulted in relatively high crop emergence rates (≥70%) under field conditions, while in greenhouse experiments, ipconazole + metalaxyl and carbathiin + thiram provided the best results. The resistance of soybean genotypes to F. avenaceum varied significantly, with genotype 90M01 having the highest emergence rate (83%) under field conditions. In greenhouse trials, the genotype Tundra was most resistant to root rot, whereas TH29002RR was the most susceptible. The results suggest that while root rot represents a significant challenge to soybean production in Alberta, fungicidal seed treatments and planting of genotypes with improved resistance may help to mitigate the impact of this disease.
Language
English
DOI
doi:10.7939/R38W38F12
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
Citation for previous publication
Nyandoro, R., Chang, K.F., Hwang, S.F., Ahmed, H.U., Strelkov, S.E., Turnbull, G.D., and Harding, M. 2015. The occurrence of soybean root rot in southern Alberta in 2014. Canadian Plant Disease Survey 95, 182–184.Nyandoro, R., Chang, K.F., Hwang, S.F., Strelkov, S.E., Turnbull, G.D., Howard, R.J., and Harding, M. 2014. The occurrence of soybean root rot in southern Alberta, Canada, in 2013. Canadian Plant Disease Survey 94, 198–200.

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