First Report of <i>Rhizoctonia oryzae</i> Causing Crown and Root Rot on Wheat (<i>Triticum aestivum</i>) Crops in Chile

Doussoulin, H.; Cárcamo, T.; Arismendi, Nolberto; Moya-Elizondo, Ernesto A.

doi:10.1094/pdis-12-15-1494-pdn

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…Members of the Rhizoctonia complex attack roots, and penetrate into and decay the culm, affecting plant vigor and wheat production (Okubara et al, 2014). In Chile, the three abovementioned species have been identified as pathogens affecting wheat crops (Moya-Elizondo et al, 2015;Doussoulin et al, 2016). However, there is little information known regarding the quantitative damage caused by these Rhizoctonia fungi in wheat grown in southern Chile.…”

Section: Introductionmentioning

confidence: 99%

Antagonistic Activity of Chilean Strains of Pseudomonas protegens Against Fungi Causing Crown and Root Rot of Wheat (Triticum aestivum L.)

Tapia

Burrows²,

Sepúlveda

et al. 2020

Front. Plant Sci.

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Seed treatments with antagonistic bacteria could reduce the severity of crown and root rot diseases in wheat crops. The objective of this study was to evaluate the potential antagonistic activity of a bacterial consortium of three Chilean strains of Pseudomonas protegens against the wheat crown and root rot pathogens Gaeumannomyces graminis var. tritici, Rhizoctonia cerealis, and Fusarium culmorum. Two field experiments were carried out on artificially infested soil during two consecutive seasons (2016-2017 and 2017-2018) in an Andisol soil of southern Chile. Control treatments (not inoculated with fungi) were also included. Each treatment included a seed treatment of spring wheat cv. Pantera-INIA with and without the bacterial consortium. Both phytosanitary damage (incidence and severity) and agronomic components were evaluated. Bacterial populations with the phlD+ gene in the wheat plant rhizosphere during anthesis state (Z6) were also quantified. In both seasons, infection severity decreased by an average of 16.8% in seeds treated with P. protegens consortium, while yield components such as spikes m −1 and number of grains per spike increased. The use of antagonistic bacteria resulted in a total yield increase only during the first experimental season (P < 0.05). In general, accumulated rainfall influenced the antagonistic effect of the consortium of P. protegens strains, accounting for the differences observed between the two seasons. The results suggest that this P. protegens consortium applied on seeds can promote plant growth and protect wheat crops against crown and root rot pathogens in Southern Chile under field conditions.

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Section: Introductionmentioning

confidence: 99%

Antagonistic Activity of Chilean Strains of Pseudomonas protegens Against Fungi Causing Crown and Root Rot of Wheat (Triticum aestivum L.)

Tapia

Burrows²,

Sepúlveda

et al. 2020

Front. Plant Sci.

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“…Common root rot (CRR) of wheat (Triticum aestivum) is a serious soilborne fungal disease in wheat growing areas of the world, such as northern China, western Canada, and northern USA [1][2][3]. CRR is caused by one or several pathogenic agents, alone or in association, such as Fusarium graminearum, F. proliferatum, Rhizoctonia oryzae and Bipolaris sorokiniana (teleomorph Cochliobolus sativus) [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Screening agents for controlling common root rot of wheat

Wei

Zhang

et al. 2019

Preprint

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Background: Common root rot (CRR) of wheat (Triticum aestivum) is a serious soilborne fungal disease in wheat growing areas of the world. The toxicity of 8 agents against three pathogens, Bipolaris sorokiniana, Rhizoctonia cerealis, and Fusarium pseudograminearum, was first determined. Then, three agents, Celest, Dividend and Raxil, were screened for mixed-agent effects against B. sorokiniana. Results: The EC50 of a 1:4 mixture of Celest and Dividend was 0.0372 mg/L, and the cotoxicity coefficient (CTC) was 160.14. The EC50 of a 1:4 mixture of Celest and Raxil was 0.0757 mg/L, and the CTC was 151.75. The results revealed the potential of two mixtures, Celest: Dividend (1:4) and Celest: Raxil (1:4), to protect wheat against B. sorokiniana. In the pot experiment, the best control effect, which was 49.85% and 32.22% at the seedling and adult stages, respectively, was achieved with Celest: Dividend (1:4). In the pot and field tests, the control effects of the two mixtures were better than those of the 3 single agents. Conclusion: This result indicated that the combination of these agents could improve the efficacy of control of CRR.

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Synergistic Action of Commercially Available Fungicides for Protecting Wheat from Common Root Rot Caused by Bipolaris sorokiniana in China

Wei

Zhang

et al. 2021

Plant Disease

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Wheat (Triticum aestivum) common root rot caused by predominant fungal pathogen Bipolaris sorokiniana occurs in all wheat-growing regions worldwide and is difficult to control. In this study, the efficacy of eight fungicides against Bipolaris sorokiniana was examined in in vtiro assays, and we determined that the combined application of two fungicides significantly inhibits the growth of fungal mycelium. The EC50 of a mixture containing Fludioxonil and Difenoconazole in the ratio 1:4 was 0.0372 mg/L, and the cotoxicity coefficient (CTC) was 160.14. Under environmentally controlled pot assay, seed treatment with the mixture of Fludioxonil and Difenoconazole in the 1:4 ratio remained the best control efficiency at seedling and adult stages, respectively. The best synergistic mixture on seed treatment was assessed in a 2-year field experiment at Hebei, China. The best control efficacy achieved at the seedling and adult stages were of 82.65% and 68.48, respectively. Overall, the in vitro mycelial growth inhibition assay and controlled environment and field studies indicated that the synergistic action of a mixture of Fludioxonil and Difenoconazole provides effective control against wheat common root rot. These findings highlight the potential application of the fungicide combination for controlling CRR and reducing the selection pressure on fungal pathogen by lessening the use of various fungicides in the field.

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First Report of Rhizoctonia oryzae Causing Crown and Root Rot on Wheat (Triticum aestivum) Crops in Chile

Cited by 3 publications

References 3 publications

Antagonistic Activity of Chilean Strains of Pseudomonas protegens Against Fungi Causing Crown and Root Rot of Wheat (Triticum aestivum L.)

Antagonistic Activity of Chilean Strains of Pseudomonas protegens Against Fungi Causing Crown and Root Rot of Wheat (Triticum aestivum L.)

Screening agents for controlling common root rot of wheat

Synergistic Action of Commercially Available Fungicides for Protecting Wheat from Common Root Rot Caused by Bipolaris sorokiniana in China

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