Evaluation of different fungicides (chemical, botanical and bio-agent) in controlling wheat blast in a blast prone area in Bangladesh

Roy, Krishna Kanta; Anwar, Babul; Mustarin, Kishowar-E; Reza, Mostofa Ali; Muzahid-E-Rahman,; Malaker, P. K.; Barma, N. C. D.; Singh, Pawan K.

doi:10.1080/03235408.2020.1827652

Cited by 11 publications

(11 citation statements)

References 8 publications

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“…Results of our analysis corroborate one of the main findings of that study for the Brazilian trials, which also reported a similar performance among the QoI+DMI premixes and a protectant fungicide. Similarly, a recent single field experiment (2019/20 season) conducted in Bangladesh reported a relatively high efficacy (65%) for MANC, which was close to our upper limit (95% confidence interval) estimate (Roy et al 2020). The yield gain from using MANC in the Bangladeshi study (744 kg/ha) was within the expected gain (close to the upper limit) of estimated trials conducted in the Subtropical region of Brazil.…”

Section: Discussionsupporting

confidence: 86%

“…However, levels as low as 45% efficacy have been reported in susceptible cultivars grown at very favorable environments for blast outbreaks in the Brazilian Cerrado (Pagani et al 2014). In Bangladesh, 19commercial fungicides had their efficacy tested on a susceptible cultivar, and the blast control levels ranged from 43% to 96% (Roy et al 2020). A 23-environment fungicide trial conducted in Brazil and Bolivia reported various levels of efficacy for QoI, DMI, and multi-site fungicides depending on disease pressure (Cruz et al 2019).…”

Section: Introductionmentioning

confidence: 99%

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Sequential post-heading applications for controlling wheat blast: a summary of fungicide performance

Ascari¹,

Barro²,

Santana³

et al. 2021

Preprint

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Wheat blast, caused by Pyricularia oryzae Triticum (PoT) lineage, is a major constraint to wheat production, mainly in the tropics of Brazil where severe epidemics are more frequent. We analyzed disease and wheat yield data from 42 uniform field trials conducted during nine years (2012 to 2020) in order to assess whether the percent control and yield response were influenced by fungicide type, region (tropical or subtropical), and year. Six treatments were selected, all evaluated in at least 19 trials. Two fungicides were applied as solo active ingredients: MANCozeb, and TEBUconazole, and four were premixes: AZOXistrobin + TEBU, TriFLoXistrobin + PROThioconazole, TFLX + TEBU, and PYRAclostrobin + EPOXiconazole. Percent control, calculated from back-transforming estimates by a meta-analysis network model fitted to the log of the means, ranged from 43% to 58%, with all but PYRA + EPOX showing efficacy greater than 52% on average, not differing among them. The variation in both efficacy and yield response were explained by region and all but TEBU performed better in the subtropics than in the tropics. Yield response from using three sequential sprays was around two times greater in the subtropics (319 to 532 kg/ha) than in the tropics (149 to 241.3 kg/ha). No significant decline in fungicide efficacy or yield response were observed in nine years of study for any of the fungicides. Our results reinforce the need to improve control by adopting an integrated management approach in the tropics given the poorer performance and lower profitability, especially for the premixes, than in the subtropics.

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Section: Discussionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Sequential post-heading applications for controlling wheat blast: a summary of fungicide performance

Ascari¹,

Barro²,

Santana³

et al. 2021

Preprint

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“…Kohli et al (2020) recommended the use of a variety combination with genotypes differing in maturity and WB resistance, in the hope to reduce the amount of field inoculum. Along with timely planting, treating seed with thiram and carboxin, and prophylactic foliar spray of triazoles and strobilurins were found to be effective in managing WB in Bangladesh (Roy et al, 2020a).…”

Section: Agronomic Managementmentioning

confidence: 99%

“…Fungicides are currently indispensable for WB management, considering the limited effects of varietal resistance. Fungicide efficacy can be judged by its outcome on a susceptible variety, but the results are not very promising and was found to be cultivar dependent in South America while it was found effective in Bangladesh (Kohli et al, 2011;Roy et al, 2020a). Fungicides become ineffective under high-disease pressure or congenial environmental conditions against the disease (Kohli et al, 2020).…”

Section: Fungicides For Wheat Blast Managementmentioning

confidence: 99%

“…A spray of mancozeb-based fungicides and a mix of QoI + DMI (quinone outside inhibitor, QoI, and demethylation inhibitors, DMI) were found effective in Brazil and Bolivia, respectively (Cruz et al, 2019). The combination of triazole and strobilurin fungicides (e.g., Nativo75 WG, Amister Top 325 SC) is also advised to farmers in Bangladesh (Sadat and Choi, 2017;BWMRI, 2020;Roy et al, 2020a). MoT isolates collected from farmer fields in Bangladesh revealed that carbendazim (Autostin 50WGD, Knowin 50WP) and QoI + DMI fungicides, viz.…”

Section: Fungicides For Wheat Blast Managementmentioning

confidence: 99%

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Wheat Blast: A Disease Spreading by Intercontinental Jumps and Its Management Strategies

et al. 2021

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Wheat blast (WB) caused by Magnaporthe oryzae pathotype Triticum (MoT) is an important fungal disease in tropical and subtropical wheat production regions. The disease was initially identified in Brazil in 1985, and it subsequently spread to some major wheat-producing areas of the country as well as several South American countries such as Bolivia, Paraguay, and Argentina. In recent years, WB has been introduced to Bangladesh and Zambia via international wheat trade, threatening wheat production in South Asia and Southern Africa with the possible further spreading in these two continents. Resistance source is mostly limited to 2NS carriers, which are being eroded by newly emerged MoT isolates, demonstrating an urgent need for identification and utilization of non-2NS resistance sources. Fungicides are also being heavily relied on to manage WB that resulted in increasing fungal resistance, which should be addressed by utilization of new fungicides or rotating different fungicides. Additionally, quarantine measures, cultural practices, non-fungicidal chemical treatment, disease forecasting, biocontrol etc., are also effective components of integrated WB management, which could be used in combination with varietal resistance and fungicides to obtain reasonable management of this disease.

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Antimicrobial Agents for Wheat Disease Management: Mode of Action and Its Application

Mahapatra¹,

Chakraborty²,

Rayanoothala³

et al. 2022

New Horizons in Wheat and Barley Research

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Evaluation of different fungicides (chemical, botanical and bio-agent) in controlling wheat blast in a blast prone area in Bangladesh

Cited by 11 publications

References 8 publications

Sequential post-heading applications for controlling wheat blast: a summary of fungicide performance

Sequential post-heading applications for controlling wheat blast: a summary of fungicide performance

Wheat Blast: A Disease Spreading by Intercontinental Jumps and Its Management Strategies

Antimicrobial Agents for Wheat Disease Management: Mode of Action and Its Application

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