Fitopatologia - Artigos
URI permanente para esta coleçãohttps://locus.ufv.br/handle/123456789/11741
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Item Colletotrichum dracaenophilum causes anthracnose on Dracaena braunii in Brazil(Australasian Plant Disease Notes, 2016-12) Macedo, D. M.; Barreto, R. W.Dracaena braunii (lucky bamboo) is a plant of West Africa widely used as an ornamental. Recently individuals bearing anthracnose symptoms were found in Viçosa (state of Minas Gerais, Brazil). Morphology was typical of Colletotrichum dracaenophilum and sequence analyses indicated a high homology to the internal transcribed spacer region and Beta tubulin with the ex-type sequences of this species. This is the first record in Brazil.Item First report of Gilbertella persicaria as the cause of soft rot of fruit of Syzygium cumini(Australasian Plant Disease Notes, 2014-12) Pinho, Danilo B.; Pereira, Olinto L.; Soares, Dartanha J.A zygomycetous fungus causing fruit soft rot was found on Sygyzium cumini in 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. cumini fruit worldwide.Item Microsatellite analysis indicates that Puccinia psidii in Australia is mutating but not recombining(Australasian Plant Pathology, 2015-07) Machado, Patrícia da S.; Alfenas, Acelino C.; Alfenas, Rafael F.; Mohammed, Caroline L.; Glen, MoragPuccinia psidii is considered a biosecurity threat in Australia because of its broad host range that includes many species of Myrtaceae which dominate Australian ecosystems. Since it was first reported in this country, in April 2010, there has been little information about the population structure of the pathogen. In this study, six microsatellite loci were analysed to determine the genetic relationship among rust specimens from different hosts and locations in Australia, New Caledonia, Hawaii and China. The Chinese and New Caledonian specimens share a multi-locus genotype with the majority of the Australian specimens. The results also indicated a close relationship between Australian and Hawaiian samples. At present, the P. psidii population in Australia is genetically uniform with no evidence of sexual recombination. Five of the 104 collections varied by one allele at single loci, indicating that mutations are common but persistence of the mutants in the population may be less common.Item Mycobiota of the weed Tradescantia fluminensis in its native range in Brazil with particular reference to classical biological control(Australasian Plant Pathology, 2016-02) Macedo, D. M.; Pereira, O. L.; Hora Júnior, B. T.; Weir, B. S.; Barreto, R. W.Tradescantia fluminensis [Commelinaceae] (common name wandering Jew or trad), is a native Brazilian herbaceous plant, which has been introduced to be used as an ornamental in many warm areas of the world. In New Zealand and other countries it has become an aggressive invader of natural ecosystems, causing serious environmental disturbances and threatening biodiversity. Surveys of pathogen and insect natural enemies of T. fluminensis were conducted over several years in Brazil to identify potential candidates for use as classical biological control agents in New Zealand. The surveys found seven pathogenic fungi associated with T. fluminensis and related Tradescantia species: Cercospora apii (leaf spot), Rhizoctonia solani (leaf blight), Sclerotium rolfsii (crown rot) and Uromyces commelinae (rust), and three novel species described in this paper: Ceratobasidium tradescantiae sp. nov. (web blight), Colletotrichum riograndense sp. nov. (anthracnose) and Kordyana brasiliensis sp. nov. (white smut-like disease). Observations of damage in the field and expected host-range suggest that K. brasiliensis and U. commelinae have the highest potential for use as classical biological control agents.