Sensitivity of <i>Mycosphaerella fijiensis</i>, Causal Agent of Black Sigatoka of Banana, to Propiconazole

Romero, R.; Sutton, T. B.

doi:10.1094/phyto.1997.87.1.96

Cited by 67 publications

(51 citation statements)

References 13 publications

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“…The mean EC 50 value for tebuconazole (0.36 μg mL -1 ) was lower than the mean determined for isolates of M. fijiensis collected in the Ivory Coast (0.73 μg mL -1 ) (Koné et al, 2008). Comparing tebuconazole with other azoles routinely applied to control BLSD, the average EC 50 found in this study was higher than that found in a population of M. fijiensis in Costa Rica (0.06 μg mL -1 ) (Romero & Sutton, 1997). However, differences in methodological procedures do not allow for direct comparisons.…”

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confidence: 74%

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Baseline sensitivity of Brazilian Mycosphaerella fijiensis isolates to protectant and systemic fungicides

Gomes¹,

Bibiano²,

Silva³

et al. 2014

Trop. plant pathol.

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Black Sigatoka caused by Mycosphaerella fijiensis is a foliar disease that affects banana plants and large amounts of fungicides are required to prevent crop losses. Intensive applications of single-site fungicides can select for fungicide-resistant isolates. The objective of this study was to assess the sensitivity of 60 isolates of M. fijiensis to commonly used fungicides. Using two different protocols, microtiter and Petri plate tests, the effective concentration at which mycelium growth is reduced by 50% (EC 50 ) was determined for thiophanatemethyl, tebuconazole, chlorothalonil and mancozeb. Additionally, partial sequences of the cytochrome b gene were obtained for 46 isolates to detect the G143A mutation, commonly associated with strobilurin resistance. The EC 50 values for tebuconazole and thiophanate-methyl ranged from 0.02 to 1.39 and from 0.008 to 8.22 μg mL -1 , respectively. For chlorothalonil, the lowest and highest EC 50 values were 0.39 μg mL -1 and 53.7 μg mL -1 , respectively. For mancozeb, approximately 50% of the isolates had EC 50 values greater than 1000 μg mL -1 . No mutation was found in the isolates assayed for strobilurin resistance. There was no correlation between sensitivity levels to any fungicide and geographic region. Low EC 50 values were estimated for most fungicides but, some isolates had high EC 50 values for mancozeb.

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confidence: 74%

“…The DMI fungicides inhibit the biosynthesis of sterol C-14 α-demethylation of 24-methylenedihydrolanosterol, a precursor of the cell membrane component ergosterol in fungi (Brent & Hollomon, 2007). Resistance to DMIs is also known and resistant isolates of M. fijiensis to propiconazole were reported (Romero & Sutton, 1997).…”

mentioning

confidence: 99%

Baseline sensitivity of Brazilian Mycosphaerella fijiensis isolates to protectant and systemic fungicides

Gomes¹,

Bibiano²,

Silva³

et al. 2014

Trop. plant pathol.

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“…Fungicide resistance to strobilurins has also been very fast in most banana-growing countries, and did not exceed 3 years' use in Costa Rica [38]. A significant shift in the sensitivity to DMI fungicides was also reported in Costa Rica after these fungicides had been used for more than 7 years [39]. After the emergence of resistance, first in a localized area, resistant strains progressively diffuse in most of the banana plantations of the same country [33,38].…”

Section: Blsd Causes Increasing Difficulties For Controlmentioning

confidence: 98%

Black Leaf Streak Disease is challenging the banana industry

Bellaire¹,

Fouré²,

Abadie³

et al. 2010

Fruits

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-Introduction. Black Leaf Streak Disease (BLSD) is regarded as the most economically important threat that the banana industry has to face. Effectively, this foliar disease affects leaf photosynthesis but, above all, reduces the greenlife of fruits, that cannot be exported in cases of severe infestation. Main characteristics of Black Leaf Streak Disease. More than 20 Mycosphaerella species have been described on bananas. Leaf spot diseases of bananas are caused by some species of this complex, of which M. fijiensis (BLSD) and M. musicola (Sigatoka disease) are the most important. M. fijiensis is an invasive species that has totally replaced M. musicola in most banana-exporting countries, which was conducive to increasing difficulties in banana leaf spot control. BLSD causes increasing difficulties for control. Since all banana cultivars grown in the banana industry are highly susceptible to BLSD, the control of this disease relies on aerial applications of fungicides according to either systematic frameworks (mostly contact fungicides) or forecasting strategies (mostly systemic fungicides). In a banana-exporting country where M. fijiensis has been reported, BLSD control becomes increasingly more difficult. This evolution is essentially due to the rapid emergence of fungicide resistance, and is conducive to a significant increase in the cost of disease control but, above all, to increasing negative environmental effects. Challenges for the banana industry. Because of the rapid adaptation of M. fijiensis, the banana industry must be prepared for significant evolution. We propose various parameters that should be monitored at different levels (disease assessment parameters, evaluation of chemical control efficiency, global evaluation of BLSD economic incidence) to rationalize such evolution. The modelization of BLSD effects on bunch mass and greenlife should enable defining acceptable disease thresholds and optimizing bunch weight and harvest stage according to agronomic practices. On the other hand, fungicide use is conducive to significant environmental impact and must be limited. Forecasting strategies should be used wherever systemic fungicides are still efficient. Finally, the predominance of a unique type of susceptible cultivar is unsustainable and the recourse to resistant varieties in an integrated strategy is undoubtedly the future of BLSD control.France / Musa / disease control / fungal diseases / Mycosphaerella fijiensis / resistance to chemicals La Maladie des Raies Noires défie l'industrie de la banane.Résumé -Introduction. La Maladie des Raies Noires (MRN) est la plus grande menace à laquelle est confrontée l'industrie de la banane. En effet, cette maladie foliaire affecte la photosynthèse des bananiers mais, surtout, elle entraine une réduction du potentiel de conservation des fruits qui ne peuvent être exportés lorsque les bananiers sont sévèrement atteints. Principales caractéristiques de la MRN. Plus de 20 espèces du genre Mycosphaerella ont été décrites sur le bananier, mais les cercosp...

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“…The continuous use of a single product or products of the same chemical group promotes the onset of pathogen strains resistant to the fungicides used. The use of doses below the recommended dose also generates selection pressure favoring resistant pathogen strains, resulting in reduction of the effectiveness of fungicides, as found in Central America in the case of strobilurin (Marín et al, 2003) and propiconazole (Castro et al, 1995;Guzmán and Romero, 1997;Romero and Sutton, 1997).…”

Section: Introductionmentioning

confidence: 99%

Genetic diversity of Mycosphaerella fijiensis in Brazil analyzed using an ERIC-PCR marker

Silva¹,

Paixão²,

Queiroz³

et al. 2014

Genet. Mol. Res.

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ABSTRACT. The Enterobacterial repetitive intergenic consensus (ERIC)marker was used to analyze the genetic variability of Mycosphaerella fijiensis, the causative agent of Black Sigatoka disease in banana plants. A total of 123 isolates were used, which were divided into populations based on their original hosts and collection sites in Brazil. A total of 9 loci were amplified, 77.8% of which were found to be polymorphic. The genetic diversity found in the population was 0.20. Analysis of molecular variance (AMOVA) demonstrated that the highest level of genetic variation is within populations. Cluster analysis revealed three main groups in Brazil, with no correlation between geographic and genetic distance.

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Sensitivity of Mycosphaerella fijiensis, Causal Agent of Black Sigatoka of Banana, to Propiconazole

Cited by 67 publications

References 13 publications

Baseline sensitivity of Brazilian Mycosphaerella fijiensis isolates to protectant and systemic fungicides

Baseline sensitivity of Brazilian Mycosphaerella fijiensis isolates to protectant and systemic fungicides

Black Leaf Streak Disease is challenging the banana industry

Genetic diversity of Mycosphaerella fijiensis in Brazil analyzed using an ERIC-PCR marker

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