73 documents found, page 1 of 8
A Reliable Molecular Diagnostic Tool for CA90 (Castanea sativa × Castanea crena...
Yussif, Toufiq Soale; Cruz, Nadine Evora da; Coelho, Valentim; Gouveia, Maria Eugénia; Choupina, AltinoChestnut trees are an essential source of both food and timber. However, the severe threats from invasive pests and diseases compromise their existence and productivity. In Europe, chestnut hybridization programs have been initiated to produce resilient rootstocks in response to ink disease. However, the gap in the identification of these hybrid plants is typically based on field observations and Morphological ...
A Reliable Molecular Diagnostic Tool for CA90 (Castanea sativa × Castanea crena...
Yussif, Toufiq Soale; Cruz, Nadine Evora da; Coelho, Valentim; Gouveia, Maria Eugénia; Choupina, Altino BrancoChestnut trees are an essential source of both food and timber. However, the severe threats from invasive pests and diseases compromise their existence and productivity. In Europe, chestnut hybridization programs have been initiated to produce resilient rootstocks in response to ink disease. However, the gap in the identification of these hybrid plants is typically based on field observations and morphological ...
Characterization of chestnut bark fungal communities in healthy trees and bligh...
Coelho, Valentim; Nunes, Luís; Moura, Luísa; Gouveia, Maria EugéniaVarious fungal species together with Cryphonectria parasitica (Murr.) Barr. have been isolated from chestnut tissues with blight symptoms. Microfungi remain in cankers during tissue healing, which occurs by transmitting hypovirulence by Cryphonectria hypovirus 1 (CHV1) compatible strains. However, studies focused on the diversity and ecology of the non-C. parasitica taxa on chestnut bark are lacking. This work ...
Dose-response effects of copper, potassium silicate, potassium fosfonate, metal...
Marques, Filipe M.; Coelho, Valentim; Moura, Luísa; Gouveia, Maria EugéniaEuropean Chestnut (Castanea sativa) is one of several tree species that is affected by Phytophthora root rot. Disease syndrome include root rot that is evidenced above soil by yellow discoloration of leaves, die-back and continuous and severe tree decline. Apoplectic symptoms also occur and tree suddenly collapse during hot weather conditions of summer. Phytophthora root rotting of fruit trees are frequently tr...
Baiting bioassays and DNA-PCR based methods for detection of Phytophthora speci...
Gouveia, Maria Eugénia; Moura, Luísa; Machado, Júlia Melo; Coelho, ValentimChestnut Ink Disease (CID) is a destructive and a lethal disease of sweet chestnut (Castanea sativa Mill.) that is associated with different soil borne Phytophthora species. CID is very difficult to control because cultural and chemical measures provide limited effects and didn´t prevent disease spread. The aim of this study was to validate different methodologies used for Phytophthora detection from soil, symp...
Manual de boas práticas para o tratamento biológico do cancro do castanheiro (C...
Gouveia, Maria Eugénia; Bragança, Helena; Moura, Luísa; Coelho, ValentimO cancro do castanheiro é uma doença associada ao fungo Cryphonectria parasitica (Murril) Barr, espécie de origem asiática, invasora e muito agressiva em castanheiro que provoca a morte dos ramos e progressivamente de toda a árvore. A European and Mediterranean Plant Protection Organization (EPPO) categoriza o fungo C. parasitica como um organismo de quarentena da lista A2 ou seja, um organismo de quarentena ma...
Um bioensaio rápido e sensível na deteção de Phytophthora a partir do solo de c...
Machado, Júlia Melo; Coelho, Valentim; Gouveia, Maria EugéniaA doença da tinta do castanheiro (DTC) é uma doença endémica nos soutos portugueses apresentando surtos epidémicos cíclicos que causam grande mortalidade. Os Oomicetas, Phytophthora cinnamomi e Phytophthora cambivora são os parasitas mais frequentemente associados com a DTC embora outras espécies de Phytophthora possam também estar presentes. Os parasitas atacam as raízes e todo o seu ciclo de vida ocorre na ri...
Programa para Tratamento biológico do Cancro do Castanheiro com estirpes hipovi...
Gouveia, Maria Eugénia; Coelho, Valentim; Moura, LuísaO Cancro do Castanheiro é uma doença bem conhecida em fitopatologia e um exemplo clássico do efeito devastador associado à introdução de um fungo parasita exótico e invasor. A doença associada ao fungo de origem asiática, Cryphonectria parasitica, foi descrita pela primeira vez em castanheiros americanos em 1905 e rapidamente se instalou em toda a área de dispersão natural do Castanea dentata. Na Europa a doenç...
Natural spread of mycoviruses a puzzling and dazzling issue for biocontrol of c...
Gouveia, Maria Eugénia; Moura, Luísa; Coelho, ValentimMycoviruses are widespread viruses in filamentous fungi considered ubiquitous in all groups. Cryphonectria hypovirus 1 (CHV1) of the Hypoviridae family is included in the genus Hypovirus. Hypovirus are well-studied biological control agent of chestnut blight a lethal disease of Castanea sativa Mill. Unlike many mycoviruses, which are cryptic or latent in their host, CHV1 reduce virulence, reduce pigmentation an...
In vitro antagonism evaluation of endophyte Chaetomium aureum against Cryphonec...
Coelho, Valentim; Machado, Júlia Melo; Guerra, Inês; Gouveia, Maria EugéniaThe European chestnut tree (Castanea sativa Mill.) is threatened by various microfungi that affect its production. In the trunk and branches infected by chestnut blight (Cryphonectria parasitica (Murril) Barr.) it was observed the presence of several microfungi that co-occur in the presence of the disease among which the endophytic fungus Chaetomium aureum Chivers. Many species of the genus Chaetomium are descr...