Encontrados 10 documentos, a visualizar página 1 de 1
Molecular characterization of Portuguese populations of the pinewood nematode B...
Valadas, Vera; Laranjo, Marta; Mota, Manuel; Oliveira, SolangeBursaphelenchus xylophilus is the causal agent of pine wilt disease and a worldwide pest with high economic impact. Since its first diagnosis in Portugal in 1999, it has been subjected to quarantine measures with impact on forest health and ecosystem stability, significantly affecting international trade of wood products. The disease was detected in the north and centre of continental Portugal and, since 2008, ...
A survey of entomopathogenic nematode species in continental Portugal
Valadas, Vera; Laranjo, Marta; Mota, ManuelEntomopathogenic nematodes (EPN) are lethal parasites of insects, used as biocontrol agents. The objectives of thisworkwere to survey the presence of EPNin continental Portugal and to characterize the different species. Of the 791 soil samples collected throughout continental Portugal, 53 were positive for EPN. Steinernema feltiae and Heterorhabditis bacteriophora were the two most abundant species. Analysis of...
The pine wood nematode, Bursaphelenchus xylophilus, in Portugal: possible intro...
Valadas, Vera; Laranjo, Marta; BARBOSA, Pedro; Espada, Margarida; Mota, Manuel; Oliveira, SolangeThe pine wood nematode (PWN), Bursaphelenchus xylophilus, the causal agent of pine wilt disease (PWD), is a major world-wide pathogen and pest of pine, with impacts on forest health, natural ecosystem stability and international trade. In Portugal, PWN was first diagnosed in 1999, the first occurrence also for Europe. The disease was recently detected on the island ofMadeira and in northern Spain. In an attempt...
Three species of entomopathogenic nematodes of the family Steinernematidae (Nem...
Valadas, Vera; Mracek, Z; Oliveira, Solange; Mota, ManuelAbstract In order to determine the species of entomopathogenic nematodes in Continental Portugal, a survey was conducted in the country. Nematodes were recovered from soil samples collected from Alentejo, Algarve, center and the north of Portugal from 2006-2009. Isolates were identified based on morphology and sequence analysis. Phylogenetic analysis was based on sequences of partial 28S (D2D3), internal transc...
First report of the genus Heterorhabditis (Nematoda: Heterorhabditidae) from co...
Valadas, Vera; Vieira, Paulo; Oliveira, Solange; Mota, ManuelUntil recently, the only entomopathogenic nematode (EPN) species reported from continental Portugal, was of the genus Steinernema. Following a national survey of EPNs in continental Portugal, several natural and managed habitats have been surveyed in the southern part of the country. From 57 soil samples collected using the Galleria mellonella trapping method, three samples yielded EPN. Morphological characteri...
Bursaphelenchus Fuchs, 1937 (Nematoda: Parasitaphelenchidae) species associated...
AKBULUT, Sulyman; KETEN, A; RYSS, Alexandre; VALADAS, Vera; VIEIRA, Paulo; MOTA, ManuelA survey for Bursaphelenchus nematodes, associated with different conifer trees, was conducted in several forest areas in the northern regions of Turkey. Only pine trees (Pinus nigra, P. pinaster and P. sylvestris) yielded Bursaphelenchus specimens. Nematodes were identified using several morphological diagnostic characters of the genus (male spicule structure, number of lateral incisures, number and distributi...
Detailed morphobiometric studies of Bursaphelenchus xylophilus and characterisa...
Penas, Ana Catarina; Bravo, Maria Antónia; Valadas, Vera; Mota, ManuelDetailed studies on Bursaphelenchus xylophilus are provided in this contribution. Comparative observations between field and cultured populations of this species demonstrated significant size differences: cultured specimens overall displayed larger size in all morphometric parameters. A principal component analysis (PCA) of the individuals undergoing moulting allowed their separation in four groups namely J2-J3...
First report of an entomopathogenic nematode from continental Portugal
Valadas, Vera; BOYLE, Stephan; VIEIRA, Paulo; KAKOULI-DUARTE, Thomae; MOTA, ManuelIn continental Portugal no information is available concerning the occurrence of entomopathogenic nematodes. During a survey in several different habitats from the southern regions of the country, several isolates where identified as Steinernema feltiae. This represents the first report of an entomopathogenic nematode genus for continental Portugal.
Preliminary survey of the pinewood nematode in Turkey
Akbulut, Suleyman; Vieira, Paulo; Ryss, Alexandre; Yuksel, Besir; Keten, Akif; Mota, Manuel; Valadas, VeraA survey was conducted in the northern conifer forests of Turkey in 2003 and 2004 for the pinewood nematode, Bursaphelenchus xylophilus . Wood samples were collected from declining pine trees, located in the following target areas: Düzce, Ankara, Bolu, and Artvin. Nematodes were extracted from over 310 samples and were observed and identified. B. xylophilus was not detected in any samples. Bursaphelenchus speci...
Bursaphelenchus antoniae sp. n. (Nematoda: Parasitaphelenchidae) associated wit...
Penas, Ana Catarina; METGE, Kai; MOTA, Manuel; VALADAS, VeraBursaphelenchus antoniae sp. n. is described and illustrated. Dauer juveniles were isolated from the body of the large pine weevil, Hylobius sp., collected from maritime pine (Pinus pinaster) stumps, in Portugal. Bursaphelenchus antoniae sp. n. was reared and maintained in P. pinaster wood segments and on Petri dish cultures of the fungi Botrytis cinerea and Monilinia fructicola. The new species is characterise...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||