Azoxystrobin and propiconazole offer significant potential for rice blast (Pyricularia oryzae) management in Australia

Pak, Dolar; You, Ming Pei; Lanoiselet, Vincent; Barbetti, Martin J.

doi:10.1007/s10658-016-1084-6

Cited by 25 publications

(16 citation statements)

References 31 publications

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“…In the in vitro tests, the EC 50 values of azoxystrobin and propiconazole against P. oryzae were reported in the range of 0.006-2.02 ug/mL and 0.06-0.91 ug/mL, respectively 13,33 . The EC 50 values of azoxystrobin and propiconazole against this fungus were both 0.5 ug/mL.…”

Section: Discussionmentioning

confidence: 99%

“…The efficacy of fungicides in controlling rice diseases was investigated in the current study to determine the pathogens' baseline sensitivity or resistance and the fungicides' disease control potential under field conditions 12,13 . Azoxystrobin was reported to be more effective than propiconazole in controlling rice blast disease in the seedling stage in Australia 13 . Treating rice seeds with pyroquilon and azoxystrobin resulted in the greatest reduction in rice blast disease severity, whereas carboxin + thiram and tricyclazole significantly reduced fungi in seeds 11 .…”

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confidence: 99%

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Efficacy of fungicides in controlling rice blast and dirty panicle diseases in Thailand

Kongcharoen

Kaewsalong

Dethoup

2020

Sci Rep

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In this study, the fungicidal activities of the fungicides azoxystrobin, difenoconazole + propiconazole, carbendazim, flutriafol, fluopyram + tebuconazole, mancozeb and thiophanate-methyl against rice blast and dirty panicle pathogens were evaluated under laboratory and field conditions. Mancozeb exhibited the highest level of fungicidal activity against the blast pathogen Pyricularia oryzae, with an EC50 value of 0.25 parts per million (ppm). The combination of two fungicides, fluopyram + tebuconazole, showed the strongest fungicidal effect against Bipolaris oryzae and Curvularia lunata, with EC50 values of 0.587 ppm and 0.435 ppm, respectively. Meanwhile, carbendazim and flutriafol demonstrated the best level of fungicidal activity against Fusarium incarnatum, with the lowest EC50 values of 0.211 ppm and 0.214 ppm, respectively. The results showed that the fungicides, triazole and strobilurin, had significant effects against rice blast and dirty panicle diseases. The combination of fluopyram + tebuconazole, when applied twice, was the most effective in reducing dirty panicle disease by up to 60% and increasing rice yield by 29% more than the untreated control. Fluopyram + tebuconazole, difenoconazole + propiconazole, flutriafol and azoxystrobin achieved stronger fungicidal activity against rice blast disease, reducing its severity by 32–33% when applied twice by foliar spraying. However, carbendazim, mancozeb and thiophanate-methyl had low to moderate fungicidal activity against both rice diseases in this study.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Efficacy of fungicides in controlling rice blast and dirty panicle diseases in Thailand

Kongcharoen

Kaewsalong

Dethoup

2020

Sci Rep

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“…With the higher availability of nutrients due to this fertilization, the fungus is able to detect the metabolic modifications of the host when in contact with the leaf surface, accelerating its growth. In this case, the susceptibility to fungicides with systemic activity allows protecting the plants from infection by reducing mycelial growth and the germination of conidia (Chen et al, 2015;Pak et al, 2017). In studies conducted in China, the fungicide azoxystrobin presented more than 73% efficacy in rice blast control (Chen et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

Occurrence of rice blast on and grain quality of irrigated rice fertilized with nitrogen and silicates

Oliveira

Marchesan

David

et al. 2019

Pesq. agropec. bras.

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How to cite OLIVEIRA, L.M. de; MARCHESAN, E.; DAVID, R. de; WERLE, I.S.; ARAMBURU, B.B.; DONATO, G.; SILVA, A.L da; COSTA, I.F.D. da. Occurrence of rice blast on and grain quality of irrigated rice fertilized with nitrogen and silicates.Abstract -The objective of this work was to evaluate the effects of fertilization with nitrogen topdressing and silicates, as well as of the use of fungicides, on the occurrence of rice blast on panicles, milling yield, and whole grains, vitreous grains, and chalky kernels in a flood-irrigated rice cultivar sensitive to the disease. Two experiments were conducted in a randomized complete block design, in a 4×4×2 factorial arrangement, with four replicates: in experiment 1, four doses of nitrogen × four doses of calcium and magnesium silicate on soil × with and without fungicides; and, in experiment 2, four doses of nitrogen × four doses of potassium silicate applied on leaves x with and without fungicides. At the doses above 60 kg ha -1 nitrogen without fungicides, there was an increase of rice blast severity on panicles, a decrease in the percentage of whole and vitreous grains, and an increase in chalky kernels and chalky area. The greatest effects of silicates occurred without fungicides. Fungicide use reduced the severity of rice blast on panicles. Milling yield ranged from 60 to 70% in both experiments. The control of rice blast with fungicides maintains high rice grain quality, milling yield, and percentages of whole and vitreous grains.

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“…However, in our data, equol can inhibit growth, conidiation, conidial germination, and appressorial formation. In addition, based on mycelium growth, the EC 50 of a collection of rice blast isolates in Australia were 0.02 to 2.02 µg/mL for azoxystrobin and 0.06 to 1.91 µg/mL for propiconazole [ 42 ]. The EC 50 for azoxystrobin and kresoxim-methyl were 0.006 to 0.056 and 0.024 to 0.287 µg/mL, respectively, in inhibiting mycelial growth of 80 M. oryzae isolates in Anhui Province of China [ 43 ].…”

Section: Discussionmentioning

confidence: 99%

Equol, a Clinically Important Metabolite, Inhibits the Development and Pathogenicity of Magnaporthe oryzae, the Causal Agent of Rice Blast Disease

Wang

Yin

et al. 2017

Molecules

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Equol, a metabolite of soybean isoflavone daidzein, has been proven to have various bioactivities related to human health, but little is known on its antifungal activity to plant fungal pathogens. Magnaporthe oryzae is a phytopathogenic fungus that causes rice blast, a devastating disease on rice. Here, we demonstrated that equol influences the development and pathogenicity of M. oryzae. Equol showed a significant inhibition to the mycelial growth, conidial generation and germination, and appressorial formation of M. oryzae. As a result, equol greatly reduced the virulence of M. oryzae on rice and barley leaves. The antifungal activity of equol was also found in several other plant fungal pathogens. These findings expand our knowledge on the bioactivities of equol.

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Azoxystrobin and propiconazole offer significant potential for rice blast (Pyricularia oryzae) management in Australia

Cited by 25 publications

References 31 publications

Efficacy of fungicides in controlling rice blast and dirty panicle diseases in Thailand

Efficacy of fungicides in controlling rice blast and dirty panicle diseases in Thailand

Occurrence of rice blast on and grain quality of irrigated rice fertilized with nitrogen and silicates

Equol, a Clinically Important Metabolite, Inhibits the Development and Pathogenicity of Magnaporthe oryzae, the Causal Agent of Rice Blast Disease

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