Marcelo Carmona

Marcelo Carmona
Universidad de Buenos Aires | UBA · Department of Plant Production

Professor

About

117
Publications
29,934
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908
Citations
Citations since 2017
55 Research Items
651 Citations
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2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150

Publications

Publications (117)
Article
Late leaf spot (LLS) is the most important foliar disease of peanuts in Argentina and in other peanut production areas, causing defoliation and yield losses. In this study, six isolates obtained from symptomatic leaflets collected in Córdoba, Argentina, were characterized based on the morphology of the colony and conidia, as well as molecularly usi...
Article
Rice grain discoloration (RGD) is a disease of complex aetiology for which there are no resistant varieties. Due to the need to better define the environmental conditions that favour the disease, the aims of this work were to (i) identify the predominant fungi associated, (ii) determine the meteorological variables most closely related, and (iii) d...
Article
Tan spot (TS) of wheat caused by Pyrenophora tritici-repentis (Ptr) is an important disease worldwide. Premixes of quinone outside inhibitors (QoI) and demethylation inhibitors are the most frequently used fungicides for TS control in Argentina. Recently, QoI resistance was reported in Ptr populations in Argentina, where the prevalence and intensit...
Article
Full-text available
Araujia hortorum is a perennial vining plant species native to South America. It was introduced into many countries for ornamental and medicinal purposes as well as for its edible fruits, but it has become highly invasive, generating severe environmental problems. Biological control using bioherbicides and natural compounds is an interesting contro...
Article
Wheat blast, caused by Magnaporthe oryzae, is considered a threat to wheat production globally. Yet, several epidemiological aspects of the disease are poorly understood. To elucidate these aspects, cross infection studies and molecular markers were utilized to identify alternate hosts (AH) that allow the permanence of M. oryzae pathotype Triticum...
Article
Full-text available
A bioactive disubstituted nonenolide, named truncatenolide, was produced by Colletotrichum truncatum, which was collected from infected tissues of soybean showing anthracnose symptoms in Argentina. This is a devastating disease that drastically reduces the yield of soybean production in the world. The fungus also produced a new trisubstituted oct-2...
Article
Ramularia leaf spot (RLS) caused by the fungus Ramularia collo-cygni (Rcc) has become a threat to barley production in Argentina. All barley varieties are susceptible to RLS; thus, disease management relies on fungicides like quinone-outside inhibitors (QoIs), demethylation inhibitors (DMIs) and succinate dehydrogenase inhibitors (SDHIs). Europe re...
Article
In the main productive area of Argentina, decays caused by Botrytis cinerea, Alternaria alternata, and Alternaria spp. lead to important postharvest losses in pears during medium- and long-term storage. In view of the problems associated with the use of chemical synthetic fungicides, and attending to current demands for global production of safe fo...
Preprint
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Pyricularia spp is a fungal complex whose best known representative is Pyricularia oryzae. It also affects other weeds that grow alongside the rice culture, posing greater risk of contribute as primary inoculum for development, survival and dissemination of pathogen. During monitoring of species weeds near of rice culture in Corrientes (Argentina),...
Article
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p>Since the start of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) causing the coronavirus disease 2019 (COVID-19) pandemic, the concepts of serial and generation intervals have been used as key epidemiological measures to understand the transmission dynamics of the disease. We carefully examined and repurposed these concepts to...
Article
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RESUMEN Definir el momento de aplicación de fungicidas en el cultivo de maíz no es sencillo y no debería basarse en un único criterio. Algunas recomendaciones se basan exclusivamente en aspectos fisiológicos y fenológicos del cultivo, o en la expectativa de incrementos en el rendimiento. Sin embargo, otras investigaciones recomiendan considerar el...
Article
Full-text available
Pseudomonas fluorescens 9 and Bacillus subtilis 54, proposed as biofungicides to control Mac-rophomina phaseolina, a dangerous pathogen of soybean and other crops, were grown in vitro to evaluate their ability to produce metabolites with antifungal activity. The aim of the manuscript was to identify the natural compounds responsible for their antif...
Article
Using culture studies and molecular techniques, the brown rot polypore Fibroporia gossypium was identified from a cellar in an old building of Buenos Aires city, the second record of the species in an urban environment in Argentina. The fungus formed large mycelial masses hanging from a wooden support and growing on the walls but did not form basid...
Article
Full-text available
Multisite fungicides have been used for many years in fruit and vegetable crops worldwide. Cases of the fungi resistance development to these fungicides have been rare. From the 2002 season onwards, with the outbreak of Asian soybean rust in Brazil, caused by Phakopsora pachyrhizi, site-specific fungicides became the main weapon for its control. Fr...
Poster
Full-text available
The current management of diseases in barley in Argentina lies on the use on seed coated and foliar fungicides. In addition to causing a high impact on the environment, it generates selection pressure on pathogens causing resistance to fungicides. Integrated disease management (IDM) proposes strategies that include field rotation, host genetic resi...
Poster
Full-text available
Phosphites (F) (elicitors) are salts derived from phosphorous acid that combined with elements such as Ca2+, K+ and Mn2+; they activate defense mechanisms and promote plant growth, with a direct antifungal effect. Depending on the F used, they improve the absorption and assimilation of nutrients, tolerance to abiotic stress and performance. The F o...
Article
Tan spot, caused by the fungus Pyrenophora tritici‐repentis (Ptr), is a disease that has become more prevalent and intense in wheat crops in Argentina in recent years. Failure to control the disease with strobilurin fungicides, which were once effective, has been observed in different zones where wheat is grown. However, whether or not true resista...
Article
ABSTRACT Spot blotch of barley, caused by Bipolaris sorokiniana, has increased its intensity during the last growing seasons in Argentina. The in vitro inhibitory effect of different fungicide premixes on the mycelial radial growth of 10 B. sorokiniana isolates from different locations was assessed. Effective fungicide concentration that caused 50%...
Poster
Full-text available
Los datos aportados permiten demostrar dos cosas: a) que la semillas es la principal fuente de inoculo del patógeno, y b) la necesidad de realizar medidas de control eficientes dirigidas a las semillas, por el ato potencial epidemiológico del microrganismo. Conclusiones Materiales y Métodos Para detectar la presencia de T. padwickii en las semillas...
Data
Principales valores de incidencia del patogeno A padwickii en semillas de arroz
Article
The increase in food production requires reduction of the damage caused by plant pathogens, minimizing the environmental impact of management practices. Soil‐borne pathogens are among the most relevant pathogens that affect soybean crop yield. Soybean sudden death syndrome (SDS), caused by several distinct species of Fusarium, produces significant...
Article
Root colonization with arbuscular mycorrhizal fungi (AMF) improves plant tolerance against soil-borne pathogens. The purpose of the present study was to explore the efficacy of the AMF Rhizophagus intraradices (N.C. Schenck & G.S. Sm.) as a biocontrol agent against Fusarium pseudograminearum (O’Donnell and Aoki) in wheat plants grown under greenhou...
Article
Two new penta- and tetrasubstituted cyclopentenones, named phaseocyclopentenones A and B (1 and 2), together with guignardone A (3), were isolated from Macrophomina phaseolina cultures. The phytopathogenic fungus was isolated from infected soybean tissues showing charcoal rot symptoms in Argentina. Charcoal rot is a devastating disease considering...
Article
El hongo Trichoconiella padwickii es uno de los principales patógenos de la semilla de arroz en la provincia de Corrientes, Argentina. Con el objetivo de cuantificar la eficiencia de transmisión (Et) desde la semilla a coleoptilos de arroz se realizó un ensayo in vivo, utilizando semillas de las variedades Taim, Puitá INTA-CL e Irga 424. Las semill...
Chapter
Wheat stripe rust (SR), caused by the fungus Puccinia striiformis f. sp. tritici (Pst), is one of the most aggressive crop diseases worldwide that threatens global food security. In Argentina, the disease caused the worst epidemics in 2017 affecting about three million hectares. The occurrence of the epidemics was anomalous, as for 87 years there h...
Article
Background: The emergence of azole resistance in non-fumigatus Aspergillus strains is on the raise. Objectives: To study the susceptibility profiles and the molecular mechanisms of azole-resistance of environmental and clinical strains of Aspergillus flavus from Argentina. Methods: Thirty-five A. flavus isolates (18 from soybean seeds and chic...
Article
Cercospora species cause cercospora leaf blight (CLB) and purple seed stain (PSS) on soybean. Because there are few resistant soybean varieties available, CLB/PSS management relies heavily upon fungicide applications. Sensitivity of 62 Argentinian Cercospora isolates to demethylation inhibitor (DMI), methyl benzimidazole carbamate (MBC), quinone ou...
Article
Full-text available
First described in Europe in 1777, stripe rust (SR) caused by Puccinia striiformis Westend. f. sp. tritici Erikss (Pst) is one of the most important and destructive diseases of wheat worldwide. Until 2000, SR was mainly endemic to cooler regions, but since then, new aggressive strains have emerged, spread intercontinentally, and caused severe epide...
Article
Cercospora leaf blight (CLB) of soybean was believed to be caused only by Cercospora kikuchii worldwide. However, recent studies that include molecular phylogenetic analyses reveal that several cryptic species within Cercospora are associated with the disease. In a previous study, following a survey of commercial soybean fields in Santa Cruz, Boliv...
Article
Full-text available
Cercospora kikuchii (Tak. Matsumoto & Tomoy.) M.W. Gardner 1927 is an ascomycete fungal pathogen that causes Cercospora leaf blight and purple seed stain on soybean. Here, we report the first draft genome sequence and assembly of this pathogen. The C. kikuchii strain ARG_18_001 was isolated from soybean purple seed collected from San Pedro, Buenos...
Presentation
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Palabras claves: MOR, fungicidas, Cercospora sojina, resistencia Cercospora sojina ocasiona la mancha ojo de rana (MOR) en el cultivo de soja, enfermedad de comportamiento policíclico de gran importancia debido a los daños que ocasiona y su forma de aparición explosiva (Carmona et al., 2010, Carmona 2014). Se detectó por primera vez en Argentina en...
Poster
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O fungo Bipolaris sorokiniana é o agente causal da mancha marrom da cevada. Na Argentina, durante as últimas campanhas agrícolas, esta doença aumentou sua prevalência e intensidade nas principais áreas produtoras. O objetivo deste trabalho foi estudar a sensibilidade in vitro de diferentes isolados de B. sorokiniana a diferentes fungicidas. Um tota...
Article
Botrytis cinerea is a necrotrophic plant pathogen that causes gray mold: a disease inflicting significant damage and crop losses in a wide range of cultivated plant species in Argentina and elsewhere. In Argentina, control of gray mold with the two mainstay fungicides, Carbendazim (Car) and Procymidone (Prc), has become ineffective, suggesting that...
Article
Yellow rust (YR), caused by Puccinia striiformis f. sp. tritici, is one of the most destructive diseases of wheat worldwide. In 2017, YR emerged in Argentina and spread quickly into three million hectares, causing damage at levels only seen during the severe epidemics during the late 1930s. This widespread occurrence coincided with reports of newly...
Article
Full-text available
Seed health is one of the most important factors affecting the quality of chickpea (Cicer arietinum) seeds. The present study aimed to compare and identify the best incubation methods for detecting Ascochyta rabiei associated with chickpea seeds. Four protocols were compared for their sensitivity in detecting A. rabiei: T1) Incubation on paper subs...
Article
Full-text available
RESUMEN Pyricularia spp. es un complejo fúngico causante de la enfermedad conocida como tizón en más de 50 especies de la familia Poaceae. El más conocido es Pyricularia oryzae Cavara, patógeno en cultivos principales como arroz, trigo, mijo, cebada y malezas. Con el objetivo de actualizar el rango de hospedantes, diferenciar la sintomatología, ais...
Article
During the summer of 2017, 38 Cercospora spp. isolates were collected from soybean leaves displaying symptoms of Cercospora leaf blight (CLB) from commercial soybean fields at three locations in Santa Cruz, Bolivia. Portions of cytochrome b (N = 38) and calmodulin (N = 37) were amplified, sequenced, edited, and assembled. Two representative isolate...
Article
Septoria brown spot (Septoria glycines) and Cercospora leaf blight (Cercospora kikuchii) are late season foliar diseases (LSFD) that co-occur every year in the soybean growing regions of Argentina. Repeated use of commercial, formulated mixes of strobilurin-triazole fungicides to control LSFD has prompted the need for tactics to increase the effica...
Article
Full-text available
RESUMEN La roya amarilla, también llamada estriada o lineal, es una enfermedad de los cultivos de cereales (trigo y cebada) y gramíneas, causada en trigo por Puccinia striiformis f. sp. tritici (Pst), que es conocida desde hace varios cientos de años. El objetivo principal de esta revisión es analizar los aspectos genéticos y epi-demiológicos más i...
Article
Frogeye leaf spot (FLS) of soybean caused by Cercospora sojina Hara is an important disease in the Argentine Pampas region. The primary inoculum sources of the disease are infected seeds and plant debris. Thus, use of pathogen-free or fungicide-treated seeds is crucial to prevent the introduction and further spread of the disease. The aims of this...
Poster
Full-text available
Cercospora leaf blight (CLB; Cercospora spp.) is a late-season soybean disease of economic importance in Argentina and southern United States. Epidemiological characterization of CLB is central to its control and management, yet temporal progress of CLB remains poorly understood, in part, due to lack of objective methods to assess the disease folia...
Poster
Full-text available
Cercospora leaf blight (CLB; Cercospora spp.) is a major soybean disease in Argentina and southern United States. Methods to quantify and monitor CLB intensity in the field remain subjective, thus there is need for practical and objective systems that can be used reliably in CLB quantitative studies. We have developed an on-plant-canopy system to m...
Chapter
Chemical control of plant diseases is one of the most commonly used management measures in agriculture. This is because fungicides have been critical in preventing losses due to fungal plant diseases and have thus become an integral part of efficient food production systems. However, as with herbicides and insecticides, misuse of fungicides can gen...
Article
We examined the biocontrol and the differential production of H2O2 and in the relationship Macrophomina phaseolina – PGPR in soybean seedling. Fungal colonisation was efficiently prevented by inoculation with Pseudomonas fluorescens 9. Its ability to improve ROS production and gene expression of antioxidant enzymes could be related to its capacity...
Article
All crops are negatively affected by several abiotic and biotic stresses, alone or jointly; however, some microorganisms, such as arbuscular mycorrhizal fungi (AMF), are able to alleviate them. Here, we investigated the effects of the AMF Rhizophagus intraradices (N.C. Schenck & G.S. Smith) C. Walker & A. Schüßler on soybean plants (Glycine max L.)...
Article
A current problem in the chemical control of late-season soybean diseases (LSD) is the lack of scientific guidelines to determine whether or not a fungicide application is needed, and if needed, to further determine a better fungicide application timing. To help in that decision process, Carmona et al. developed a scoring system (SS) based on weath...
Article
Full-text available
Abstract. Soybean root and stem rots caused by soil-borne pathogens are diseases commonly found in soybean fields, and one of the most important causes of crop losses. In the present study, the mycelial sensitivity of Fusarium virguliforme, F. tucumaniae, Sclerotin-ia sclerotiorum and Macrophomina phaseolina was evaluated on potato dextrose agar me...
Article
Full-text available
RESUMEN La resistencia a fungicidas tiene un costo financiero para productores agropecuarios, para los fabricantes de fungicidas y para la sociedad toda. Asimismo, el surgimiento de la resistencia reduce la disponibi-lidad de ingredientes activos con diferente modo de acción disponibles en la lucha contra los hongos fitopatógenos, dificultando sobr...
Article
Full-text available
BACKGROUND Use of fungicide seed treatments for control of soybean soilborne diseases such as Pythium damping-off has increased worldwide. However, emergence of Pythium strains resistant to metalaxyl-M has prompted the need for alternative technologies to fungicides for damping-off control. The use of phosphites (Phis) has been proposed as a method...
Article
Full-text available
Late season diseases cause yield reductions to soybean grown worldwide. In Argentina, fungicide mixtures composed of quinone outside inhibitors (QoIs) and demethylation inhibitors (DMIs), and the newly introduced succinate dehydrogenase inhibitors (SDHIs), have been effective in managing these diseases.Nevertheless, the risk of selecting strains wi...
Article
Full-text available
The aim of this study was to evaluate in vitro the mycelial susceptibility of Trichoconiella padwickii to different active ingredients through average median concentration IC50 calculation. Inoculum disks were seeded on bean agar at different concentrations (0.1; 1; 10; 30, 50; 100 and 1000mg/l) of various fungicides. After seven days the colony di...
Chapter
Full-text available
Although the use of fungicides is a common disease control practice in soybean worldwide, there is still no clear understanding about the right application timing to manage these diseases. Late season soybean diseases (LSD), a combination of various diseases that affect soybean leaves, stems, pods and seeds, cause premature senescence and reduce gr...
Poster
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In Alto Valle of Río Negro and Neuquén, B. cinerea was reported among the main postharvest pathogens in D’Anjou pears. According to global demands of effective and environmentally friendly strategies, the aims of this study were: 1) to quantify in vitro the inhibition of mycelial growth; 2)to evaluate the potential of resistance inducer substances...
Article
Full-text available
The aim of the present study was to evaluate indigenous PGPR (Plant growth promoting rhizobacteria) previously isolated from Argentina's soybean fields for their in vitro antagonistic effects on the control of Fusarium tucumaniae and F. virguliforme, in two separated in vitro assays. In assay 1, the bacteria that showed the highest significant (P <...
Poster
Full-text available
Argentina es uno de los principales países productores y exportadores de manzanas del mundo. Cripps Pink (CP) es una variedad de alto valor comercial en el mercado internacional. Las enfermedades de postcosecha limitan considerablemente su comercialización. Los efectos inhibitorios del fosfito de potasio (PhiK) han sido demostrados en diferentes pa...
Article
Full-text available
In Argentina, more than 60 % of the tobacco crops are grown in the northwestern part of the country and where Rhizoctonia solani leads to a reduction in crop yield and quality. In this study, 35 isolates of Rhizoctonia were obtained from 32 tobacco fields in northwestern Argentina and characterized by both morphological and molecular approaches. Ba...
Article
Plant growth promoting rhizobacteria (PGPR) are potential agents to control plant pathogens and their combined use with biopesticides such as phosphites may constitute a novel strategy to incorporate in disease management programs. In the present study, 11 bacterial isolates were selected on the basis of their antagonistic activity against Macropho...
Article
Full-text available
Frogeye leaf spot of soybean caused by Cercospora sojina is an economically important foliar disease in warm and humid regions. In Argentina, the severity and prevalence of FLS has increased during the last years. The main control strategies include the use of tolerant or resistant cultivars, seed and foliar fungicide treatment and crop rotation. C...
Article
Full-text available
Analisou-se trabalhos publicados contendo valores da concentração de um fungicida que controla 50% (CI50) um dado fungo. Na análise considerou-se: (i) a CI50 determinada in vitro e in vivo para um dado fungicida e para um fungo específico; (ii) a concentração (g/ha) de ingrediente ativo do fungicida indicada para o controle da doença alvo no campo;...
Poster
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En los últimos años la intensidad de las Enfermedades de Fin de Ciclo de la soja aumentó en todas las áreas productivas de Argentina, principalmente debido a la siembra directa y a la baja rotación de cultivos. El uso de fungicidas debe ser racional para asegurar el retorno económico y evitar impactos negativos para el ambiente. El objetivo fue val...
Article
The fungus Ramularia collo-cygni B. Sutton & J. M. Waller (Rcc) was identified as the causal agent of this emerging disease on barley (Hordeum vulgare L.) based on symptoms and signs on leaves and attributes of the fungus. The common name given to the disease was "necrotic sprinkling." This disease was found for the first time on barley in fields o...
Article
Full-text available
The aim of this study was to determine the minimum conditions of wetness duration and mean temperature required for Fusarium head blight infection in wheat. The weather model developed by Zoldan (2008) was tested in field experiments for two wheat cultivars grown in 2005 (five sowing dates) and 2006 (six sowing dates) in 10 m2 plots with three repl...
Article
Full-text available
Wheat head blight, caused by the fungus Gibberella zeae (anamorph Fusarium graminearum), occurs worldwide, but for many years the disease was not considered a major problem. In the last years, however, head blight has increased its frequency and intensity and thus become one of the most damaging diseases of wheat. Fusarium Head Blight (FHB) is cons...
Article
Full-text available
With the objective of quantifying the transmission efficiency (TE) from rice seed to coleoptiles, a trial was conducted "in vivo" using seeds of the varieties BRS Taim, Puitá Inta-CL and Irga 424. Seeds were sown in plastic trays containing sterile sand as substrate and incubated in laboratory conditions at 25±2ºC and photoperiod of 12 h. The TE wa...
Article
Twenty-six isolates obtained from soybean crops (Glycine max) with typical anthracnose symptoms were identified as Colletotrichum truncatum (73 %) and C. destructivum (26 %). Their genetic relationships were studied using the AFLP method. A UPGMA phenogram divided the strains into two clusters corresponding with the two species. Genetic distances b...
Article
The fungus Trichoconiella padwickii is one of the main pathogens of rice seed in the province of Corrientes, Argentina. With the objective of quantifying the transmission efficiency (TE) from rice seed to coleoptiles, a trial was conducted "in vivo" using seeds of the varieties BRS Taim, Puita Inta-CL and Irga 424. Seeds were sown in plastic trays...
Conference Paper
Full-text available
Fusarium tucumaniae is the primary causal agent of sudden death syndrome (SDS) of soybean in Argentina. It is a soil-borne pathogen that causes root rot followed by the development of foliar symptoms, causing yield losses. Early infections, occurring at the seed stage, produced foliar symptoms and higher root rot severity, when compared to later in...
Conference Paper
Full-text available
Soybean is the most important oilseed crop in Argentina. The wide distribution of monoculture associated with no-tillage techniques has contributed to increased damage caused by diseases. Annual occurrence of foliar diseases such as brown spot (Septoria glycines) and leaf blight (Cercospora kikuchii) depend on favourable environmental conditions an...
Conference Paper
Full-text available
Soybean (Glycine max L.) Merrill is the most important and widespread oil crop in Argentina. After soybean rust (Phakopsora pachyrhizi Sydow & Sydow) epidemics, many farmers adopted foliar fungicides applications. Damages caused by late season diseases (LSD) have increased by soybean monoculture under no-till. LSD pathogens such as Septoria glycine...
Conference Paper
Full-text available
La podredumbre carbonosa del cultivo de soja (Glycine max L.) Merr. causada por Macrophomina phaseolina (Tassi) Goid., un hongo habitante del suelo, puede afectar a más de 500 especies vegetales. Su presencia suele estar asociada a períodos prolongados de sequía y altas temperaturas. El uso de cultivares resistentes es el método preferencial de con...
Article
Full-text available
The main objectives of this work were to isolate and identify the causal agents of sudden death syndrome (SDS) from samples collected in different Argentinean localities, to quantify its incidence, and to estimate yield losses. Two hundred and fifteen roots from plants with typical SDS foliar symptoms were analyzed. In order to perform pathogenicit...
Article
During the growing seasons of 2008 to 2009 and 2009 to 2010, severe outbreaks of soybean (Glycine max (L.) Merr.) frogeye leaf spot, a disease caused by Cercospora sojina Hara, occurred in several areas in Argentina (1). Two surveys were conducted in soybean fields, one in 2008 that included the provinces of Buenos Aires, Córdoba, and Santa Fe, and...
Article
Assessment of biological control of Cercospora sojina, causal agent of frogeye leaf spot (FLS) of soya bean, using three indigenous bacterial strains, BNM297 (Pseudomonas fluorescens), BNM340 and BNM122 (Bacillus amyloliquefaciens). From cultures of each bacterial strain, cell suspensions and cell-free supernatants were obtained and assayed to dete...
Article
Full-text available
In November 2011, lesions similar to those reported for Ascochyta blight (1) were observed on Cicer arietinum L. (chickpea) plants growing in three commercial fields located at Río Primero and Río Segundo (Cordoba Province) and Lobería (Buenos Aires Province), Argentina. Disease incidence (percentage of plants affected) was 100% in all fields surve...
Article
In August 2010, lesions similar to those reported for target spot were observed on Nicotiana tabacum L. plants produced in float systems in Cerrillos, Salta, Argentina. Tobacco leaves with characteristic lesions were collected from different locations in Cerrillos, Salta. Symptoms ranged from small (2 to 3 mm), water-soaked spots to larger (2 to 3...
Article
Full-text available
Strains of Pseudomonas fluorescens and Bacillus amyloliquefaciens, isolated from soybean rhizosphere, inhibited mycelial growth of Botrytis cinerea and Sclerotinia sclerotiorum, in vitro. Leaves from Brassica napus seedlings, pre-inoculated with either of these bacteria, exhibited systemic protection against fungal pathogens.
Article
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Disease severity evaluation is an important decision support for adoption of strategies and tactics for disease control. The most commonly used method to assess disease severity is visual, but the problem is repeatability, due to subjectivity and imprecision of estimates. For Puccinia sorghi, a threshold of action of 1% severity was determined, so...
Article
Full-text available
Wide distribution of soybean monoculture associated with no tillage has contributed to enhance damages caused by late diseases complex (LDC) in Argentina. LDC is a complex of diseases where Septoria glycines and Cercospora kikuchii are regarded as the major problem. Even though the use of foliar fungicides has increased, there is no rational and ec...
Article
Full-text available
Widely spread in Argentina, late season diseases (LSD), cause yield losses and seed quality changes. Leaf application of fungicides is an effective procedure to manage LSD under the current cropping conditions (monocrop and no-till system). The aims of the present study were 1) to determine causal agents of LSD, 2) to evaluate yield reduction cause...
Article
Full-text available
Of the four fusaria that have been shown to cause soybean sudden death syndrome (SDS), field surveys indicate that Fusarium tucumaniae is the most important and genetically diverse SDS pathogen in Argentina. Although none of the SDS fusaria have been shown to produce perithecia in nature, a heterothallic sexual cycle has been demonstrated for F. tu...