Página 1 dos resultados de 3280 itens digitais encontrados em 0.006 segundos

Integration of empirical and process-based models for maritime pine in Portugal

Tomé, Margarida; Fontes, Luís; Nunes, Luís; Tomé, José
Fonte: INRA Publicador: INRA
Tipo: Conferência ou Objeto de Conferência
ENG
Relevância na Pesquisa
37.04%
Forests are very important in Portugal, covering 39% of the land (agriculture occupies 33% and shrubland 21%). From those, the production forest represents 51% (28% maritime pine and 23% eucalyptus) while evergreen oaks represent 36% (23% cork oak and 13% holm oak). Other minor species cover just 12%. Maritime pine is the most important softwood in the country and the only one relevant for wood production (annual wood harvest of softwoods is close to 5 106 m3), Forest resources in Portugal are mainly driven by forest fires and wood harvest, with some impact also of afforestation and deforestation. The prediction of these drivers in the dynamics of forest resources - namely growing stock, volume growth and carbon stock - is crucial at different spatial scales, from the individual landowners, for forest management purposes, to the industry, for the planning of wood supply, as well as for the definition of forest policies. Optimization of management at local levels plays also an important role for the overall dynamics of the forest resources. Growth and yield models implemented in forest simulators appropriate for different spatial scales have been developed in the country for the most important forest species (maritime pine, eucalyptus and cork oak). The global change environment...

Pine nuts authenticity in the Portuguese market

Santos, Carla; Porfírio, Bruno; Silva, Anaísa; Faria, Miguel; Cruz, Rebeca; Ramalhosa, Elsa; Pereira, J.A.; Cunha, Sara; Casal, Susana
Fonte: Sociedade Portuguesa de Química Publicador: Sociedade Portuguesa de Química
Tipo: Conferência ou Objeto de Conferência
ENG
Relevância na Pesquisa
37.13%
Pine nuts, the edible seed of the pine tree (Pinus spp.) are a valuable commodity in the international market, with Portugal attaining the fourth position with the exclusive production of Pinus pinea. Pine nuts from different pine species differ in size, nutritional value, taste and therefore commercial values, making it necessary to grant their authenticity. Following recent reports on pine nut mislabelling in European markets, mainly with those of Asiatic origin, the main objective of the present work was to characterize the quality and authenticity of the pine nuts sold in the Portuguese market. Samples (n=15) were analysed for their main morphological and chemical characteristics (seed weight and seed size, moisture, lipid, proteins, ash, total soluble sugars, fatty acid composition, vitamin E, phytosterols, total phenolic and antioxidant activity). The morphological characterization showed highly homogeneous fruits. The chemical assays showed also a very consistent composition, with 48.9 ± 1.0% of lipids, of which 85.1 ±0.5% were unsaturated, with an increased protein content of 30.6±1.0%, all on a fresh weight basis. The sterol composition was also decidedly constant, as was the vitamin E and total phenolic content. All the results were within those reported for P. pinea. Complementary...

Pine nuts authenticity in the Portuguese market

Santos, Carla; Porfírio, Bruno; Silva, Anaísa; Faria, Miguel; Cruz, Rebeca; Ramalhosa, Elsa; Pereira, J.A.; Cunha, Sara; Casal, Susana
Fonte: Sociedade Portuguesa de Química Publicador: Sociedade Portuguesa de Química
Tipo: Conferência ou Objeto de Conferência
ENG
Relevância na Pesquisa
37.13%
Pine nuts, the edible seed of the pine tree (Pinus spp.) are a valuable commodity in the international market, with Portugal attaining the fourth position with the exclusive production of Pinus pinea. Pine nuts from different pine species differ in size, nutritional value, taste and therefore commercial values, making it necessary to grant their authenticity. Following recent reports on pine nut mislabelling in European markets, mainly with those of Asiatic origin, the main objective of the present work was to characterize the quality and authenticity of the pine nuts sold in the Portuguese market. Samples (n=15) were analysed for their main morphological and chemical characteristics (seed weight and seed size, moisture, lipid, proteins, ash, total soluble sugars, fatty acid composition, vitamin E, phytosterols, total phenolic and antioxidant activity). The morphological characterization showed highly homogeneous fruits. The chemical assays showed also a very consistent composition, with 48.9 ± 1.0% of lipids, of which 85.1 ±0.5% were unsaturated, with an increased protein content of 30.6±1.0%, all on a fresh weight basis. The sterol composition was also decidedly constant, as was the vitamin E and total phenolic content. All the results were within those reported for P. pinea. Complementary...

Role of endophytic microbial community in pine wilt disease

Proença, Diogo Alexandre Neves
Fonte: Universidade de Coimbra Publicador: Universidade de Coimbra
Tipo: Tese de Doutorado
ENG
Relevância na Pesquisa
37.09%
Pine wilt disease (PWD), a major illness of several Pinus species, native to North-America, has spread into Asia and recently into Europe. The first report in Portugal was in 1999 but since 2008 has spread to the Center-North of the country. Bursaphelenchus xylophilus, the pinewood nematode (PWN), is considered the only causative agent of PWD. In recent years, it has been proposed that PWD is a complex disease induced by both PWN and the bacteria it carries. The present thesis aimed to assess the microbial community, within the host-plant and associated with the nematode upon nematode infection in PWD, in order to elucidate the community structure and to understand roles of several bacteria involved. The endophytic microbial community structure was studied from infected and non-infected pine trees, Pinus pinaster, in Avô and Malhada areas, based on culture isolates and molecular profiling (denaturing gradient gel electrophoresis - DGGE). The endophytic strains were identified by 16S rRNA gene sequencing. The classes Acidobacteria, Actinobacteria, Alphaproteobacteria, Bacilli, Betaproteobacteria, Flavobacteria, Gammaproteobacteria and Sphingobacteriia were identified from the sampling areas. Gammaproteobacteria were the most abundant bacteria. DGGE profiles failed to produce a common pattern for PWD indicating that the microbial community was diverse and variable within diseased pine trees. DGGE detected the presence of endophytes belonging to six additional classes: Bacteroidia...

Caracterização físico-química de amostras de óleo de pinho e estudo da ação de sistemas tensoativos na atividade antimicrobiana de ativos fenólicos; Physical-chemical characterization of pine oil samples and study on surfactants systems action in antimicrobial activity of active phenolic

Oliveira, Floripes Ferreira de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 16/06/2008 PT
Relevância na Pesquisa
37.09%
Este trabalho tem como objetivo a caracterização de amostras comerciais de óleo de pinho com o intuito de identificar outros componentes que apresentem ação antimicrobiana, além do α-terpineol. Também, visa avaliar a influência de três tensoativos distintos na ação antimicrobiana do o-fenil fenol, do o-benzil p-clorofenol e do p-cloro m-cresol. Os tensoativos selecionados foram o linear alquilbenzeno sulfonato de sódio (NaLAS), uma mistura de laurato de trietanolamina e de sódio (laurato de Na/Tea) e alfa olefina sulfonada (AOS). Amostras comerciais de óleo de pinho e 61 frações, isoladas por destilação a pressão reduzida de uma amostra de óleo de pinho bruto, foram avaliadas a partir de medidas de índice de refração, curvas TG/DTG, espectroscopia no infravermelho, CG-DIC e CG-EM, características organolépticas e atividade antimicrobiana com a determinação do halo de inibição (contra Staphylococcus aureus ATCC 6538 e Salmonella choleraesuis ATCC 10708). Observou-se que as amostras comerciais apresentaram composições distintas, conforme procedência. O perfil das curvas TG/DTG permitiu uma avaliação comparativa do comportamento térmico das frações isoladas na destilação. A composição do óleo de pinho apresenta diversidade de componentes com atividade antimicrobiana inibitória. Todas as amostras de óleo de pinho apresentaram atividade bacteriostática para ambos os microrganismos e as frações...

Attraction of ambrosia beetles (Coleoptera : Scolytidae) to different tropical pine species in Brazil

Flechtmann, CAH; Ottati, ALT; Berisford, C. W.
Fonte: Amer Entomol Soc Publicador: Amer Entomol Soc
Tipo: Artigo de Revista Científica Formato: 649-658
ENG
Relevância na Pesquisa
37.13%
Ambrosia beetles are the predominant Scolytidae in Brazil. Little is known about the attractiveness of exotic conifer tree volatiles to native scolytids. Objectives were to compare the attractiveness of logs with and without bark of Pinus oocarpa Schiede, P. caribaea variety bahamensis Barrett & Golfari, P, car. variety caribaea Barrett & Golfari and P. car. variety hondurensis Barrett & Golfari over time to native scolytids in different pine stands, to compare the relative attractiveness of logs relative to ethanol traps, to determine how long it takes for logs to become attractive to ambrosia beetles and when attraction peaks occur, and to determine if volatiles released by live standing trees would mask volatiles released by logs of the same species. In young stands, Hypothenemus was the predominant insect genus, whereas in older stands Xyleborus predominated. Debarked logs trapped more beetles than logs with bark. Pine log species attractiveness was not influenced by volatiles present in the stand. Beetles were divided into the following 3 groups, based on response to log volatiles and ethanol: (1) species attracted to ethanol and not responding to pine terpenes Ambrosiodmus hagedorni (Iglesia), A. retusus (Eichhoff), X. spinulosus Blandford...

Extração, caracterização e modificação quimica por oxidação de amido de pinhão (Araucaria angustifolia); Extraction, characterization and chemistry modification by oxidation of Brazilian pine (Araucaria angustifolia)

Leilane Costa de Conto
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 27/03/2009 PT
Relevância na Pesquisa
37.24%
O pinhão, semente da Araucaria angustifolia (Betortoloni, Otto Kuntze), possui alto teor de carboidratos, principalmente amido. A literatura escassa e contraditória, em alguns pontos, indica a necessidade de um conhecimento aprofundado sobre as características do amido de pinhão, principalmente voltado ao método de extração e à modificação química para a obtenção de características específicas para sua aplicação. O presente trabalho procurou: estudar a extração de amido de pinhão por três metodologias distintas (Wosiacki e Cereda, Bello-Pérez et al. E Teixeira et al .- modificada) com e sem estocagem prévia dos pinhões; estudar as propriedades químicas, físicas e reológicas do amido nativo de pinhão extraído de sementes armazenadas por longos períodos e estudar o efeito da temperatura de processo e da concentração de cloro ativo na modificação química por oxidação nas principais propriedades do amido de pinhão. Todos os dados obtidos foram avaliados estatisticamente por análise de variância e teste de médias de Tukey (p < 0,05). Das três metodologias de extração utilizadas para pinhões in natura com 0 e 12 meses de estocagem, o método proposto por Bello-Pérez et al. (2006) foi considerado o mais apropriado a ser utilizado na extração do amido devido ao maior rendimento observado após a constatação de que o tempo de estocagem influencia nas características de rendimento e coloração do amido de pinhão. O amido de pinhão obtido por este método apresentou 14...

Population dynamics of bacteria associated with different strains of the pine wood nematode Bursaphelenchus xylophilus after inoculation in maritime pine (Pinus pinaster)

Roriz, Mariana; Santos, Carla; Vasconcelos, Marta W.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
Publicado em //2011 ENG
Relevância na Pesquisa
37.09%
For a long time it was thought that Bursaphelenchus xylophilus was the only agent of the pine wilt disease. Recently, it was discovered that there are bacteria associated with the nematodes that contribute to the pathogenesis of this disease, mainly through the release of toxins that promote the death of the pines. Among the species most commonly found, are bacteria belonging to the Bacillus, Pantoea, Pseudomonas and Xanthomonas genera. The main objective of this work was to study the effect of inoculation of maritime pine (Pinus pinaster) with four different nematode isolates, in the bacterial population of nematodes and trees, at different stages of disease progression. The monitoring of progression of disease symptoms was also recorded. Also, the identification of bacteria isolated from the xylem of trees and the surface of nematodes was performed by classical identification methods, by the API20E identification system and by sequencing of bacterial DNA. The results showed that for the symptoms progression, the most striking difference was observed for the pines inoculated with the avirulent isolate, C14-5, which led to a slower and less severe aggravation of symptoms than in pines inoculated with the virulent isolates. In general...

Pine wilt disease control in Portugal: synthesis of the scientific knowledge.

Sousa, Edmundo; Naves, Pedro; Bonifácio, Luís; Inácio, L.; Henriques, J.; Costa, R.; Carrasquinho, Isabel; Ribeiro, Bruno; Ribeiro, P.; Aguiar, A.; Evaristo, I.; Valdiviesso, T.; Palma, A.; Vieira, Paulo; Mota, Manuel
Fonte: Universidade de Évora Publicador: Universidade de Évora
Tipo: Aula
ENG
Relevância na Pesquisa
37.09%
Increased international transport of plants or plant-products have brought with them associated risks of dissemination of pests between countries and ecosystems. This was also the case in 1999 with the detection,for the first time in Portugal and in Europe,of the pine wood nematode (PWN) B.xylophilus in dead maritime pines (Pinus pinaster). This organism is the causal agent of Pine Wilt Disease (PWD)and a quarantine organism within the European Union, and therefore its introduction was received with great apprehension both in Portugal and in the rest of Europe.A key element of the nematode’s life history and the initial determinant of its ultimate impact on living potential host trees, is its transmission by insect vectors, namely longhorn beetles of the genus Monochamus (Coleoptera: Cerambycidae).ConsequentlyPWD is the result of an interaction of three distinct agents (the pine wood nematode, an insect vector and a tree host), although only the first is the fixed element whenever the disease is present, as the vector and the host can vary. Soon after the nematode’s introduction into Portugal, various studies on the local specificities and regional variations of this disease wereconducted, namely on the bioecology of the nematode B. xylophilus...

Pine Wilt Disease: A Threat to Pine Forests in Turkey?; Pine wilt disease: a worldwide threat to forest ecosystems

AKBULUT, Sulyman; Yuksel, B; VIEIRA, Paulo; Baysal, I; MOTA, Manuel
Fonte: Springer Publicador: Springer
Tipo: Parte de Livro
ENG
Relevância na Pesquisa
37.13%
The pinewood nematode, is the causal agent of pine wilt disease, a serious threat to native pine forest in eastern Asia (Japan, Korea, China and Taiwan) and some parts of North America (USA, Canada and Mexico). In 1999, this nematode was found and identified for the first time in Portugal and in Europe. The detection of this quarantine pest in Portugal has indicated the need to know more about the distribution of Bursaphelenchus spp. in coniferous trees in Europe in order to describe the geographic range of the species and to act quickly in case of the nematode’s unwanted introduction into other European regions. Pine forest has a wide distribution in Turkey that increases the number of susceptible host trees for pinewood nematode. Because of these resaons, some regions of Turkey were surveyed for the presence of the nematode. Three different species of Bursaphelenchus were found. However, B. xylophilus was not detected. The detection of B. mucronatus, very similar to B. xylophilus biologically and morphologically, is very important. The presence of this species indicates that B. xylophilus could spread easly in conifer forests of Turkey. A study was conducted to determine the pathogenicity of B. mucronatus and 80% of seedlings of P. sylvestris were wilted. Biological characteristics of M. galloprovincialis were compared with M. carolinensis...

Evidence for the involvement of ACC deaminase from Pseudomonas putida UW4 in the biocontrol of pine wilt disease caused by Bursaphelenchus xylophilus

Nascimento, Francisco; Vicente, Claudia; Barbosa, Pedro; Espada, Margarida; Glick, B; Mota, Manuel; Oliveira, Solange
Fonte: Springer Publicador: Springer
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
37.09%
Abstract Pine wilt disease, caused by the nematode Bursaphelenchus xylophilus, is responsible for devastation of pine forests worldwide. Until now, there are no effective ways of dealing with this serious threat. The use of 1-aminocyclopropane-1-carboxylate (ACC) deaminase (encoded by the acdS gene)-producing plant growth-promoting bacteria has been shown to be a useful strategy to reduce the damage due to biotic and abiotic stresses. Pinus pinaster seedlings inoculated with the ACC deaminase-producing bacterium Pseudomonas putida strain UW4 showed an increased root and shoot development and reduction of B. xylophilus induced symptoms. In contrast, a P. putida UW4 acdS mutant was unable to promote pine seedling growth or to decrease B. xylophilus induced symptoms. This is the first report on the use of ACC deaminase-producing bacteria as a potential biological control agent for a tree disease, thus suggesting that the inoculation of pine seedlings grown in a tree nursery might constitute a novel strategy to obtain B. xylophilus resistant pine trees.

Development and growth curve of the pine cones of Araucaria angustifolia (Bert.) O. Ktze, in the region of Curitiba - PR

Anselmini,Justina Inês; Zanette,Flávio
Fonte: Instituto de Tecnologia do Paraná - Tecpar Publicador: Instituto de Tecnologia do Paraná - Tecpar
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2008 EN
Relevância na Pesquisa
37.13%
The objectives of this work were to describe the development and growth rate of the pine cones of Araucaria angustifolia during and after the pollination period, to identify the period of maximum growth of the cones and the period of pollination and maturation of the pine nuts. The adult individuals were found at the Setor de Ciencias Agrarias of the UFPR, in Curitiba - PR. Collections and measurements of pine cones were made in 2003 and 2005. The diameter and the length of the pine cones were measured 15 different times in both the years. In the studied environmental conditions, the period between the pollination and maturation of the pine nuts was 20 months. The maximum pine cone growth was achieved between October and January after the pollination, and between October and April of the following year.

Resampling of Permanent Pine Rockland Vegetation Plots on Big Pine Key

Sah, Jay P.; Snyder, James R.; Ross, Michael S.; Ogurcak, Danielle
Fonte: FIU Digital Commons Publicador: FIU Digital Commons
Tipo: Artigo de Revista Científica Formato: application/pdf
Relevância na Pesquisa
37.16%
The pine rocklands of South Florida are characterized by an herbaceous flora with many narrowly endemic taxa, a diverse shrub layer containing several palms and numerous tropical hardwoods, and an overstory of south Florida slash pine (Pinus elliottii var. densa). Fire has been considered as an important environmental factor for these ecosystems, since in the absence of fire these pine forests are replaced by dense hardwood communities, resulting in loss of the characteristic pineland herb flora. Hence, in the Florida Keys pine forests, prescribed fire has been used since the creation of the National Key Deer Refuge. However, such prescribed burns were conducted in the Refuge mainly for fuel reduction, without much consideration of ecological factors. The USGS and Florida International University conducted a research study for four years, from 1998 to 2001, the objective of which was to document the response of pine rockland vegetation to a range of fire management options and to provide Fish and Wildlife Service and other land managers with information useful in deciding when and where to burn to perpetuate these unique pine forests. This study is described in detail in Snyder et al. (2005).

Diaeretus essigellae Starý and Zuparko (Hymenoptera: Braconidae: Aphidiini), a biological control for Monterey pine aphid, Essigella californica (Essig) (Hemiptera: Aphididae: Cinarini): host-specificity testing and historical context; Diaeretus essigellae Stary and Zuparko (Hymenoptera: Braconidae: Aphidiini), a biological control for Monterey pine aphid, Essigella californica (Essig) (Hemiptera: Aphididae: Cinarini): host-specificity testing and historical context

Kimber, W.; Glatz, R.; Caon, G.; Roocke, D.
Fonte: Wiley Publicador: Wiley
Tipo: Artigo de Revista Científica
Publicado em //2010 EN
Relevância na Pesquisa
37.16%
The Monterey pine aphid (Essigella californica) was accidentally introduced into Australia from the northern hemisphere before being detected in Canberra in 1998. Feeding on some members of Pinaceae, including the commercially important Pinus radiata, the aphid has now spread to almost all pine-growing areas and is considered to be an important forestry pest. In 2005, a project was commissioned to import the pine aphid parasitoid, Diaeretus essigellae, into Australia and subject it to host-specificity testing with a view to releasing it as a biological control for E. californica. In 2007, the first wasp pupae arrived at Australian quarantine facilities and emergent adults were used to establish an ongoing Australian culture. Sequencing of 28S rDNA confirmed the identity of the parasitoid and showed that its closest known relative is Diaeretus leucopterus. No-choice and choice host-specificity testing was conducted using Monterey pine aphid and eight non-target aphid species as potential hosts for D. essigellae. Regardless of the testing procedure, E. californica was the only species that was successfully parasitised. This suggests that D. essigellae is highly specific (at genus or species level) and therefore, is a suitable candidate for release into pine plantations to provide control of Monterey pine aphid in Australia. Based on these data...

PRIORITIZING CONSERVATION AREAS FOR LONGLEAF PINE FORESTS IN NORTH CAROLINA: A spatial analysis of 3 major threats (fire suppression, urbanization, and climate change)

Vorhees, Lauren
Fonte: Universidade Duke Publicador: Universidade Duke
Tipo: Masters' project
Publicado em 24/04/2015 EN_US
Relevância na Pesquisa
37.16%
Longleaf pine forest once dominated much of the landscape in the southeastern United States, but its distribution has been diminished to approximately 3% of its historical range. As a fire-dependent ecosystem, it is now widely accepted that prescribed burning is a necessary tool in longleaf pine management and restoration. In North Carolina, longleaf pine (LLP) forests currently managed with fire are concentrated in protected natural areas that tend to coincide with designated habitat for the Red-cockaded Woodpecker, one of many federally endangered species dependent on LLP forests. While single-species management has proven highly successful for endangered species, conservation of broad ecosystems like LLP may require additional pieces for prioritizing management actions. My goal for this project is to spatially assess current conditions and future projections for three major threats to longleaf pine forests: fire management changes, urbanization, and climate change. I use Red-cockaded Woodpecker habitat requirements as a proxy to isolate healthy LLP patches in North Carolina that are outside designated protected area boundaries. With these unprotected patches, I first identify areas not currently managed with prescribed burning and thus inherently at risk; second...

AN EVALUATION OF MOUNTAIN PINE BEETLE OUTBREAKS IN COLORADO AND WYOMING UNDER CLIMATE CHANGE USING GEOSPATIAL ANALYSIS

Allen, Natalie
Fonte: Universidade Duke Publicador: Universidade Duke
Tipo: Masters' project
Publicado em 26/04/2011 EN
Relevância na Pesquisa
37.09%
In the past two decades, the native mountain pine beetle (Dendroctonus ponderosae) has decimated the pine forests of Colorado and Wyoming. These infestations are an issue for local communities because of the loss of ecosystem services that these forests provide, the potential for increased fire risk in the dead stands, and the unattractive appearance of these dead trees, which result in lower property values and is an eyesore for the local population. Previous research has linked climate change to increased outbreak levels and the range expansion of this beetle. In my study, a geospatial analysis was used to identify susceptible forests under current and future climate conditions based on the mountain pine beetle’s temperature tolerance and host vegetation requirements. A climate envelope model was used, and thus the results determine the potential for mountain pine beetle attack but do not evaluate the results of future attacks. Historically, cold winter temperatures limited the range and magnitude of outbreaks; however, under the IPCC’s A1B climate scenario, nearly all of the pine forests in the study area will be susceptible by 2050. Under this scenario, some 400,000 additional acres of forest will become susceptible to outbreaks by 2050...

Comparisons of Carbon and Water Fluxes of Pine Forests in Boreal and Temperate Climatic Zones

Tor-ngern, Pantana
Fonte: Universidade Duke Publicador: Universidade Duke
Tipo: Dissertação
Publicado em //2015
Relevância na Pesquisa
37.09%

Quantifying carbon fluxes and pools of forest ecosystems is an active research area in global climate study, particularly in the currently and projected increasing atmospheric carbon dioxide concentration environment. Forest carbon dynamics are closely linked to the water cycle through plant stomata which are regulated by environmental conditions associated with atmospheric and soil humidity, air temperature and light. Thus, it is imperative to study both carbon and water fluxes of a forest ecosystem to be able to assess the impact of environmental changes, including those resulting from climate change, on global carbon and hydrologic cycles. However, challenges hampering such global study lie in the spatial heterogeneity of and the temporal variability of fluxes in forests around the globe. Moreover, continuous, long-term monitoring and measurements of fluxes are not feasible at global forest scale. Therefore, the need to quantify carbon and water fluxes and to identify key variables controlling them at multiple stands and time scales is growing. Such analyses will benefit the upscaling of stand-level observations to large- or global-scale modelling approaches.

I performed a series of studies investigating carbon and water fluxes in pine forests of various site characteristics...

Medium Density Fibreboard Manufactured from Blends of White Cypress Pine and Non-Durable Wood Species Shows Increased Resistance to Attack by the Subterranean Termite C lacteus

Evans, Philip; Dimitriades, A; Cunningham, Ross; Donnelly, Christine
Fonte: Walter de Gruyter Publicador: Walter de Gruyter
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
37.29%
Medium density fibreboards consisting of blends of the naturally durable wood species white cypress pine (Callitris glaucophylla) and non-durable wood species were manufactured in a commercial plant and subjected to a bioassay using the subterranean termite species, Coptotermes lacteus. A board composed of 30% cypress pine, 30% slash pine (Pinus elliottii) and 40% of the naturally durable hardwood species spotted gum (Corymbia maculata) was also manufactured and bioassayed against C. lacteus. The aims were to determine (i) whether boards containing cypress pine possessed increased resistance to termite attack compared to a control manufactured entirely from non-durable wood species; (ii) the relationship between the cypress pine content of boards and their resistance (if any) to termite attack; (iii) whether the termite resistance of boards containing cypress pine could be further enhanced by the addition of spotted gum fibre. There was an inverse relationship between the cypress pine content of MDF specimens and mass losses of the specimens during the bioassay; the percentage mass losses of specimens containing 11.4, 16.2 and 34.2% cypress pine being 20.3, 13.4 and 8.8%, respectively, compared to 32.8% for the control, which consisted of non-durable slash pine (80%) and hoop pine (Araucaria cunninghamii) (20%) fibre. There was strong evidence that the inverse relationship between the cypress pine content of boards and mass losses during the bioassay was linear...

Trapping Monochamus galloprovincialis (Coleoptera: Cerambycidae), Vector of the Pine Wood Nematode, with Pine Allelochemicals, in Portugal

Bonifácio,Luis; Praias,Fernando; Sousa,Edmundo
Fonte: Unidade de Silvicultura e Produtos Florestais Publicador: Unidade de Silvicultura e Produtos Florestais
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2012 EN
Relevância na Pesquisa
37.16%
Seven different trap models or variations and ten different chemical lures or combinations thereof were compared as to their efficiency to attract and capture the pine sawyer Monochamus galloprovincialis, vector of the Pine Wood Nematode (PWN) (Bursaphelenchus xylophilus) in Portugal, between 2001 and 2004. Traps were made at the INRB laboratories (former EFN), with and without a visual silhouette, with chemical lures (ethanol, α-pinene and/or turpentine) from the maritime pine (Pinus pinaster), the only host of the PWN and its vector in Portugal. They were tested in four successive assays on pine stands; the less efficient were eliminated and the best were accepted for subsequent tests. The best combination was a transparent cross-vane interception trap lured with ethanol and turpentine in separate vials. The implications of the results for control of M. galloprovincialis are discussed.

Early Detection Methods for Pine Wood Nematode Infections of Maritime Pine in Portugal

Bonifácio,Luis; Sousa,Edmundo
Fonte: Unidade de Silvicultura e Produtos Florestais Publicador: Unidade de Silvicultura e Produtos Florestais
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2011 EN
Relevância na Pesquisa
37.09%
Four different techniques for early detection of pines infected by the pine wood nematode (Bursaphelenchus xylophilus) were tested in the maritime pine within the affected zone of Setúbal peninsula, in Portugal. From the four methods tested, the wood electrical resistance only had significantly different readings from healthy pines when the tree was already visually decayed. The sap flow measurements made in six previously selected pines didn't allow any conclusion, because none of the pines died during the survey. The oleoresin flow, induced using a punch hole in the trunk, with 14cm diameter, at 1.30m height, proved to be reliable for detecting an infected pine, when there is a complete absence of resin production (99% of the observations). The flow ceases about one and a half months before decay symptoms are obvious (when over 25% of the pine's needles are yellow).