Dartanha J. Soares

Brazilian Agricultural Research Corporation (EMBRAPA) | Embrapa · Embrapa Algodao

O acesso aos mercados mais seletivos e de alto valor agregado exige cuidados com a qualidade dos produtos e, mais recentemente, com os impactos sobre os recursos ambientais. O amendoim produzido em São Paulo (87% do volume nacional) possui vários tipos de certificados de qualidade de produto, de cumprimento de regras de conduta empresariais e de te...

Gray mold is one of the most important diseases of castor crop since, under favorable conditions, it can lead to severe yield losses. Limited information is available regarding the behavior of commercial castor hybrids to this disease. Thus, the castor hybrids AG-IMA, AKB-02, MIA and TAMAR were evaluated against gray mold disease, under controlled...

Charcoal rot is an economically important fungal disease of economically important crops. Several species of the Macrophomina genus, such as M. pseudophaseolina and M. euphorbiicola, may act as the causal agents of charcoal rot. The current study evaluates: a) the diversity of vegetative compatibility reactions in Brazilian isolates of M. pseudopha...

The characterization and conservation of castor accessions in germplasm bank are essential in order to breeding programs achieve its goals. Despite Brazil having the 4th largest castor germplasm bank in the world, castor diversity in Brazil remains little explored. Thus, this study aimed at characterize castor accessions collected in different Braz...

No Brasil, o estado de São Paulo é o maior produtor de amendoim, cultivado essencialmente em áreas de sucessão com pastagem e cana-de-açúcar. Neste estudo procurou-se avaliar o desempenho ambiental de um sistema de produção de amendoim com pastagem, típico da região da Alta Paulista, usando Avaliação do Ciclo de Vida, do berço ao portão da fazenda...

O carvão do amendoim, causado pelo fungo Thecaphora frezzii, foi relatado pela primeira vez na Argentina em meados da década de 1990, e desde 2015 tem sido considerada uma das principais doenças do amendoim. Uma vez que o fungo é principalmente disperso pelas sementes, e considerando que o Brasil regularmente importa sementes da Argentina, foi obse...

O carvão do amendoim é uma doença causada pelo fungo Thecaphora frezii Carranza & Lindquist, o qual foi originalmente descrito em 1962, a partir de amostras de amendoim selvagem (Arachis sp.) que haviam sido coletadas em Aquidauana, Mato Grosso do Sul (CARRANZA; LINQUIST, 1962). Naquela época, aparentemente, pouca importância foi dada ao referido f...

Ricinus communis plants showing symptoms of root and stem rot were observed in the states of Bahia and Paraíba, Brazil. Based on the morphology and phylogenetic analyses of ITS and TEF-1α combined, the causal agents of the observed symptoms were identified as Lasiodiplodia hormozganensis and L. theobromae, pathogenicity was confirmed by fulfilling...

This study aimed to determine the sensitivity of 61 Botryotinia ricini isolates to the fungicides fluazinam and thiophanate-methyl. The isolates were originated from Goiás (n = 3), Maranhão (n = 3), Mato Grosso (n = 12), Minas Gerais (n = 1), Paraíba (n = 8), Rio Grande do Sul (n = 19) and São Paulo (n = 15) states. Mycelial discs (6 mm) removed fr...

Heterokaryosis is the association of genetically distinct nuclei in a common hyphal cytoplasm, and is a process involved in the generation of fungal variation. The fusion of the distinct nuclei within a heterokaryotic hypha produces a heterozygous diploid nucleus and is one of the stages of the parasexual cycle. A heterokaryon's viability depends o...

Macrophomina is a genus belonging to Botryosphaeriaceae that comprises well-known necrotrophic pathogens related to hundreds of plant hosts around the world. Historically, M. phaseolina is the causal agent of charcoal rot in several crops, mainly in tropical and subtropical areas around the world. However, after a recent genetic diversity study usi...

Dichotomophthora sp. is described as causing leaf spot and early foliar abscission on Anredera cordifolia in Brazil. Morphologically, the fungus fits with D. lutea, however, ITS sequence showed high homology with Bipolaris sp. recorded on Basella alba in Florida and with D. portulacae recorded on B. rubra in China. Additional studies are needed to...

Knowledge about the Brazilian fungal diversity was, until 2010, recorded in few taxonomy and ecology publications, as well as in a handful of species lists. With the publication of the Catálogo de Plantas e Fungos do Brasil and the continued availability of an online list, it has been possible to aggregate this dispersed knowledge. The version pres...

Charcoal rot, caused by Macrophomina phaseolina, is one of the most important diseases of castor (Ricinus communis) in the growing regions of Northeastern Brazil, particularly in the State of Bahia, which concentrates 65% of the country’s production. The pathogenicity and aggressiveness of the charcoal rot pathogen was assessed in twenty-seven isol...

A zygomycetous fungus causing fruit soft rot was found on Sygyzium cuminiin Northeast Brazil. Based on morphological and phylogenetic analyses, the fungus was identified as Gilbertella persicaria. This is the first report of this fungus causing the decay of S. cuminifruit worldwide.

A survey of fungal pathogens associated with cane tibouchina, Tibouchina herbacea (Melastomataceae), was conducted in the neotropics, concentrated in south and southeastern Brazil and aimed at finding potential biological control agents for this herbaceous invasive weed for introduction into Hawaii. Numerous fungal species were found, including fiv...

Amphobotrys ricini is reported for the first time causing gray mold on the ornamental plant Acalypha herzogiana. This new host-pathogen association record is based on collections made at two localities in Brazil. Morphology of the fungus is described herein and its pathogenicity to A. hezorgiana and Ricinus communis was demonstrated.

Plasmopara invertifolia sp. nov. causes severe leaf distortion and necrosis on Helichrysum bracteatum, a beautiful and important ornamental plant for trade in Brazil. This oomycete pathogen is distinguished from other species of Plasmopara on Asteraceae by its smaller sporangia and larger sporangiophores, which justifies the proposition of a new ta...

Since the first report of daylily rust (Puccinia hemerocallidis) in Brazil in the state of São Paulo in 2001, it spread during that decade and is now found in a very broad area encompassing central, northeastern, southern and southeastern Brazil. It is now regarded as one of the major disease problem for this popular ornamental. Events in Brazil we...

Castor (Ricinus communis L.) is one of the oldest cultivated crops, but currently it represents only 0.15% of the vegetable oil produced in the world. Castor oil is of continuing importance to the global specialty chemical industry because it is the only commercial source of a hydroxylated fatty acid. Castor also has tremendous future potential as...

Castor (Ricinus communis L.) is one of the oldest cultivated crops, but currently it represents only 0.15% of the vegetable oil produced in the world. Castor oil is of continuing importance to the global specialty chemical industry because it is the only commercial source of a hydroxylated fatty acid. Castor also has tremendous future potential as...

Castor plant (Ricinus communis L.) is a non-edible oilseed crop with unique oil features for the chemistry industry. The crop was very important in the mid and late nineteenth century and also during WWI. After that the crop lost its importance in developed countries (Godfrey, 1923), but in India and Brazil it has remained as the most important non...

Carlos AC, Soares DJ 2012 – The anamorphic state of Leveillula taurica recorded on Cleome spinosa in north-eastern Brazil. Mycosphere 3(3), 289–292, Doi 10.5943 /mycosphere/3/3/3 The anamorphic state of Leveillula taurica was found causing a powdery mildew disease on Cleome spinosa in north-eastern Brazil. Its chasmothecial state was not observed o...

The new species Pyriculariopsis calatheae is described causing leaf spots on Calathea longifolia (Marantaceae). It represents an addition to the mycobiota of the tropical seasonal semi-deciduous montane forest, a component of the Brazilian Atlantic forest and a highly threatened ecosystem. KeywordsAnamorphic fungi–Dematiaceous hyphomycetes–Maranta...

A powdery mildew fungus belonging to the genus Oidium subgen. Fibroidium was found on Heliotropium indicum in north-east Brazil. This fungus was identified as Oidium heliotropii-indici and is described for the first time on this host from Brazil.

A new genus, Claviradulomyces, morphologically typical of Odontotremataceae, is proposed to accommodate the new species Claviradulomyces dabeicola. The genus is characterised by its ornamented periphysoids, and long-cylindric, sigmoid, acuminate ascospores. Genetically, C. dabeicola falls within the Ostropales, but the Odontotremataceae have been v...

Sagitaria montevidensis (arrowhead) is one of the worst weeds of irrigated rice. Control of this weed by means of chemical herbicides has become increasingly difficult on account of herbicide resistance in populations of S. montevidensis. Mycoherbicides are recognized as potential alternative tools against S. montevidensis. In Australia, the fungus...

1 Embrapa Algodão; 2 CCBS-UEPB; 3 CCA-UFPB; dartanha@cnpa.embrapa.br RESUMO – Durante o ano de 2009 foram encontradas plantas de mamoneira apresentando sintomas de murcha seguido de seca e posterior morte em uma área experimental destinada a multiplicação de sementes de linhagens femininas descendentes da cultivar BRS Energia, na fazenda experiment...

Sagitaria montevidensis (arrowhead) is one of the worst weeds of irrigated rice. Control of this weed by means of chemical herbicides has become increasingly difficult on account of herbicide resistance in populations of S. montevidensis. Mycoherbicides are recognized as potential alternative tools against S. montevidensis. In Australia, the fungus...

Miconia calvescens (Melastomataceae) is a shrub or small tree native to the Neotropics that has become one of the worst invaders of forest ecosystems, particularly in Pacific islands such as Hawaii and French Polynesia. It has been a target for biological control for more than 10 y, both with arthropod and pathogen natural enemies. Until now Collet...

Alternaria thunbergiae is recorded as the cause of leaf spots on Thunbergia alata (Acanthaceae), for the first time from Brazil.

Nine species of fungi on the aquatic weed Sagittaria montevidensis (arrowhead) in southern and southeastern Brazil were collected, identified, described and illustrated in a survey for possible biological control agents against this weed. Seven of them are anamorphic fungi, Alternaria alternata, Botrytis cinerea, Cercospora apii, Cercospora sagitta...

The new species Mycosphaerella americanae (Ascomycota, Mycosphaerellaceae) associated with stem and foliage necrosis on Phytolacca americanae is newly described from Brazil. The spermatial state (Asteromella) as well as the conidial state (Septoria) were also collected and described.

The new combination Calidion bombacis is proposed for the rust species formerly known as Uredobombacis. This nomenclatural change is based on the examination of newly collected material of this fungus from a new host, Bombacopsisglabra from Brazil, and reexamination of the isotype. Until now this fungus was only known to occur in Asia (China, India...

The new combination Calidion bombacis is proposed for the rust species formerly known as Uredo bombacis. This nomenclatural change is based on the examination of newly collected material of this fungus from a new host, Bombacopsis glabra from Brazil, and reexamination of the isotype. Until now this fungus was only known to occur in Asia (China, Ind...

Ipomoea carnea Jacq., also known as morning glory, is native of tropical America, and its purported centre of origin is the Paraguay Basin. This plant is feared by ranchers because of its well-documented toxicity to cattle. Because of its showy flowers, it became a popular ornamental in Brazil and was introduced into others countries, becoming an a...

Amphobotrys ricini is recorded for the first time causing natural blight on inflorescences of the ornamental euphorbiaceous hosts Acalypha hispida and Jatropha podagrica in Brazil.

Botrytis cinerea is recorded for the first time causing grey mould onOxalis latifolia (Oxalidaceae) from Brazil.

Peronospora alta is recorded for the first time causing downy mildew onPlantago major (Plantaginaceae) in Brazil.

Three Pseudocercospora species were found associated with leaf spots on five different members of the family Piperaceae in a stretch of Atlantic rain forest in the municipality of Viçosa, Minas Gerais, Brazil. Pseudocercospora piperis is newly recorded on Piper crassinervium and Piper mollicomum. It was also found in association with Pothomorphe um...

Fungal pathogens of the invasive riparian weed Hedychium coronarium from Brazil and their potential for biological control. Fungal Diversity 28: 85-96. This paper gives an account about fungi collected during a survey in southern Brazil for pathogens of the riparian weed, Hedychium coronarium. This is a pantropical weed of the family Zingiberaceae...

These proceedings contain the full-length papers and abstracts of papers presented at the symposium. Subjects covered include: ecology and modelling in biological control of weeds; benefits, risks and cost analysis of biological weed control; target and biological control agent selection; pre-release specificity and efficacy testing; regulations an...

Durante os anos de 2004-2006, observou-se em plantas de Holmskioldia sanguinea (Verbenaceae), cultivadas no Campus da Universidade Federal de Viçosa (UFV) a ocorrência de manchas foliares. As estruturas fúngicas presentes nas lesões foram examinadas e corresponderam a Cercospora apii e Pseudocercospora holmskioldiae. Este é o primeiro relato destes...

Optimal environmental conditions for induction of germination and infection of Puccinia substriata var. penicillariae in different pearl millet cultivars The rust caused by Puccinia substriata var. penicillariae in Pearl millet (Pennisetum glaucum) induces yield losses in this forage crop. Considering the lack of information about this disease in B...

A black mildew caused by Asteridiella pittieri (Meliolales) was observed on the foliage of the ornamental species Duranta repens var. aurea (Verbenaceae) in the states of Minas Gerais and São Paulo, Brazil. This is the first record of this fungus in Brazil. Although the impact of the disease on the host is minimal, infected plants become unsightly...

Abstract—Two new species of Mycosphaerella (Ascomycota, Mycosphaerellaceae) are described on Sapium glandulosum from Brazil. Both Mycosphaerella sapiicola and M. sapii differ in ascospore shape and size from the other species of Mycosphaerella described on Sapium (M. sodiroana). An anamorph belonging to Septoria was also found associated with M. sa...

Pearl millet (Pennisetum glaucum) is a major staple food crop in the drier parts of the old world, like Africa and India. Recently, its cultivation became more widespread in no-tillage crop farming systems in central Brazil, but it is also being used for cultivation during the dry season in other areas in Brazil. An emerging problem for the wider a...

Hymenachne amplexicaulis (capybara grass) has been listed among Australia’s 20worstweeds (orweeds of national significance) but has not been officially recognised as a target for biological control. Nevertheless, collections are being made of fungal pathogens associated with this amphibious grassy weed and of other aquatic weeds native to Brazil. T...

The aecial stage of Puccinia scirpi (Aecidium nymphoidis) is newly recorded on Nymphoides indica in Brazil. Both the host plant and the rust are known to have a wide distribution around the world but P scirpi was not previously known to occur in South America. The fungus is described and illustrated.

Abstract—Meliola thalliformis var. major var. nov., associated with leaf spots on Bathysa australis (Rubiaceae), is described and illustrated. During fungal collections undertaken in a stretch of Atlantic tropical rainforest of the nature reserve Parque Estadual da Serra do Brigadeiro in the state of Minas Gerais (Brazil), leaves of the tree Bathy...

Fruit rot of Solanum gilo caused by Phytophthora capsici A fruit rot of Solanum gilo, caused by Phytophthora capsici, is reported for the first time. The isolate obtained from S. gilo was also capable of inducing fruit rot on green pepper (Capsicum annuum), zucchini (Cucurbita moschata), cucumber (Cucumis sativus), and chayote (Sechium eduli).

Pseudocercospora siparunae, a new cercosporoid fungus found to be associated with leaf spots on Siparuna reginae, is described and illustrated.

Cordana versicolor, a new dematiaceous anamorphic fungus, was found in Brazil associated with leaf spots on the herbaceous ornamental Canna denudata. It differs morphologically from related species and is the first species in the genus proven to be pathogenic to a member of the Cannaceae. It produces boxing-glove-shaped appresoria apically on germ...

A survey of the pathogenic mycobiota of the following aquatic weeds was undertaken in Brazil: Eichhornia crassipes and Eichhornia azurea (Pontederiaceae); Pistia stratiotes (Araceae); Ipomoea carnea (Convolvulaceae); Hymenachne amplexicaulis (Poaceae); Nymphoides indica (Menyanthaceae); Ludwigia spp. (Onagraceae); Hedychium coronarium (Zingiberacea...