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2011, Summa Phytopathologica
Leaf blight and defoliation of Eugenia stipitata Mc Vaugh and Eugenia patrisii Vahl, caused respectively by Cylindrocladium candelabrum (Calonectria scoparia) and C. spathiphylli (Calonectria spathiphylli) are reported in the state of Pará, Brazil. On both host species, the disease is characterized by dark brown lesions of different sizes and shapes. A whitish bright sporulation, resembling Cylindrocladium is observed on the necrotic lesions by using a stereomycroscope or a pocket lense (10-20 X). Under favorable conditions and depending on the level of infection, intense premature tree defoliation may also be found.Although the conidial germination and mycelial growth were higher at 25ºC for both species, C. candelabrum was more sensitive to the variation of temperature (10, 20, 30 and 40 ºC) than C. spathiphylli. This is the first report of C. candelabrum and C. spathiphylli on Eugenia stipitata (araçá-boi) and on Eugenia patrisii (ubaia-da-amazônia), respectively in Brazil.
Plant Disease
First Report of Calonectria Leaf Blight Caused by Calonectria metrosideri on Eucalyptus benthamii in Brazil2019 •
ABSTRACT Calonectria-leaf-blight (CLB) caused by Calonectria spp. is one of the main foliar disease of eucalypt plantation in Brazil. Recent studies have shown the potential impact of this disease and the hyper-diversity in the pathogen population. However, there are no studies addressing the occurrence and identification of Calonectria species in Mato Grosso state, Brazil. The aims of this study were to conduct surveys of soils and trees in eucalypt plantation in southeast of Mato Grosso and identify which species are dominant by DNA sequence analyses. The phylogenetic analyses were performed by using partial sequences of translation elongation factor 1-α (tef1a), β-tubulin (tub2), calmodulin (cal) and histone H3 (his3) gene regions. A great variability in Calonectria was observed in the Mato Grosso state, since different phylogenetic groups were found in a survey from a single collection place. Based on multigene phylogenetic analyses, a new phylogenetic lineage is proposed (Calonectria sp. new.), Calonectria pteridis is reported in Eucalyptus urophylla in Mato Grosso, and the occurrence of Calonectria pseudometrosideri causing CLB on Eucalyptus spp. is reported for the first time in the world. Keywords: forest pathology, Cylindrocladium, eucalyptus farming, planted forest. RESUMO A mancha-de-calonectria causada por Calonectria spp. é uma das principais doenças foliares da cultura do eucalipto no Brasil. Estudos recentes têm mostrado o potencial impacto dessa doença e a enorme variabilidade existente na população do patógeno. No entanto não há estudos sobre ocorrência e a identificação de espécies de Calonectria no estado de Mato Grosso. Assim, os objetivos desse trabalho foram fazer um levantamento das espécies de Calonectria que ocorrem no sudeste de Mato Grosso e identificar por meio de análises de sequência de DNA, quais espécies são predominantes. As análises filogenéticas foram realizadas com sequencias parciais dos genes fator de elongação (tef1a), β-tubulina (tub2), calmodulina (cal) e histona H3 (his3). Foi observada uma grande variabilidade de Calonectria no estado de Mato Grosso, uma vez que foram encontrados diferentes grupos filogenéticos em isolados obtidos a partir de um único local de coleta. Com base na análise filogenética multi-gênica, uma nova linhagem filogenética é proposta (Calonectria sp. new.), Calonectria pteridis é encontrada em Eucalyptus urophylla no Mato Grosso, e relata-se pela primeira vez no mundo a ocorrência de Calonectria pseudometrosideri causando a mancha-de-calonectria em Eucalyptus spp. Palavras-chave: patologia florestal, Cylindrocladium, floresta plantada, mancha-foliar.
2012 •
Forest Pathology
Calonectria metrosideri , a highly aggressive pathogen causing leaf blight, root rot, and wilt of Metrosideros spp. in Brazil2013 •
2016 •
Plant Disease
First Report of Ceratocystis Wilt Caused by Ceratocystis fimbriata on Caryocar brasiliense Trees in Brazil2017 •
Australasian Plant Pathology
Fungal pathogens of Calotropis procera (rubber bush), with two new records from Brazil1999 •
Mycological Research
Phloeosporella kitajimae sp. nov. associated with leaf spots and blight of Eugenia dysenterica in central Brazil1993 •
2019 •
The forest species popularly known as “pau-pretinho” (Cenostigma tocantinum Ducke) is one of the most used in urban arborization of the municipality of Manaus, Amazonas (Brazil). It is a native species to the Amazon and has low susceptibility to attack by pests and pathogens (GARCIA; MORAES; LIMA 2009). Throughout the year 2018, symptoms were observed on the leaves positioned in the lower third of the crown of C. tocantinum trees. The symptoms were characterized by areas of light brown color in the center and dark brown edges observed on leaves. The symptomatic trees were located on campus of Federal University of Amazonas (UFAM), in Manaus, where the temperature and rainfall ranged from 24°C to 33°C, and 113 mm to 335 mm in this period. Small fragments (2 to 3 mm) of symptomatic leaf tissues were surface disinfested, plated on potato dextrose agar (PDA) amended with 0,25 g.L of chloramphenicol, incubated at 25°C and hyphal tips were transferred to fresh PDA plates. The monoculture ...
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