Consulta: subjectFacets:"Dieback"
Registros recuperados: 7
Data/hora: 13/06/2024 08:07:21

La muerte descendente y necrosis floral del zapote mamey (Pouteria sapota (Jacq.) H.E. Moore &amp; Stearn) en Guerrero, México
Provedor de dados: Depósito Institucional Abierto de Documentos Digitales del Colegio de Postgraduados (COLPOS DIGITAL )
Autores: Vásquez López, Alfonso.
En México existen aproximadamente 712 especies frutales pertenecientes a 75 familias y 169 géneros, 620 se cultivan en huertos familiares con baja tecnología o sujetas a recolección. Esta es una de las razones por lo que aún no se determina con certeza el potencial de mercado que pueden tener estos frutales en el ámbito nacional o internacional; sin embargo, existen evidencias de su importancia en la industria alimenticia e industrial (Borys y Borys, 2001).   La familia sapotaceae, originaria de áreas tropicales, incluye aproximadamente 450 especies de árboles y arbustos distribuidas desde el sureste de Estados Unidos, México, América Central hasta Las Antillas y de Sudamérica (Paraguay, Uruguay y Chile) (Pennington, 1990). Algunas especies producen frutos...
Tipo: Tesis
Palavras-chave: Zapote-mamey; Muerte descendente; Postulados de Koch; Lasiodiplodia theobromae; Histopatología; Doctorado; Fitopatología; Zapote mamey; Dieback; Koch's postulates; Histopathology.
Ano: 2008
URL: http://hdl.handle.net/10521/1629

Re-evaluation of Phytophthora citricola isolates from multiple woody hosts in Europe and North America reveals a new species, Phytophthora plurivora sp. nov
Provedor de dados: Naturalis Digital Academic Repository
Autores: Burgess, T. Jung, T.I.
During large-scale surveys for soilborne Phytophthora species in forests and semi-natural stands and nurseries in Europe during the last decade, homothallic Phytophthora isolates with paragynous antheridia, semipapillate persistent sporangia and a growth optimum around 25 °C which did not form catenulate hyphal swellings, were recovered from 39 host species in 16 families. Based on their morphological and physiological characters and the similarity of their ITS DNA sequences with P. citricola as designated on GenBank, these isolates were routinely identified as P. citricola. In this study DNA sequence data from the internal transcribed spacer regions (ITS1 and ITS2) and 5.8S gene of the rRNA operon, the mitochondrial cox1 and β-tubulin genes were used in...
Tipo: Article / Letter to the editor
Palavras-chave: Beech; Citricola; Decline; Dieback; Forest; Multivora; Nursery; Oak; Phylogeny.
Ano: 2009
URL: http://www.repository.naturalis.nl/record/532257

Phytophthora multivora sp. nov., a new species recovered from declining Eucalyptus, Banksia, Agonis and other plant species in Western Australia
Provedor de dados: Naturalis Digital Academic Repository
Autores: Scott, P.M.; Burgess, T.I.; Barber, P.A.; Shearer, B.L.; Stukely, M.J.C.; Hardy, G.E.St.J.; Jung, T.
A new Phytophthora species, isolated from rhizosphere soil of declining or dead trees of Eucalyptus gomphocephala, E. marginata, Agonis flexuosa, and another 13 plant species, and from fine roots of E. marginata and collar lesions of Banksia attenuata in Western Australia, is described as Phytophthora multivora sp. nov. It is homothallic and produces semipapillate sporangia, smooth-walled oogonia containing thick-walled oospores, and paragynous antheridia. Although morphologically similar to P. citricola, phylogenetic analyses of the ITS and cox1 gene regions demonstrate that P. multivora is unique. Phytophthora multivora is pathogenic to bark and cambium of E. gomphocephala and E. marginata and is believed to be involved in the decline syndrome of both...
Tipo: Article / Letter to the editor
Palavras-chave: Decline; Dieback; Forest; Jarrah; Phylogeny; Phytophthora citricola; Tuart.
Ano: 2009
URL: http://www.repository.naturalis.nl/record/531947

Ctenarytaina spatulata, Taylor: soil water, mineral nutrients and their relations to eucalyptus dieback
Provedor de dados: PFB - Pesquisa Florestal Brasileira
Autores: Santana, Dalva Luiz de Queiroz; Bellote, Antonio Francisco Jurado; Dedecek, Renato Antonio.
To develop this study it was used Eucalyptus grandis seedlings planted in three-liter pots, filled with soil collected on areas where dieback occurred (Arapoti, PR). The experiment consisted of six soil water level treatments, with and without insects. The experimental design was randomized blocks with 6 replications, arranged in six cages inside a green house. Three cages received insects and other three, not. The experiment consisted of the following treatments: 1. Sat. - soil water content maintained on the saturated conditions; 2. CC – soil water content maintained on field capacity; 3. 60 - humidity of the soil to 60% of the field capacity; 4. 30 - humidity of the soil to 30% of the field capacity; 5. A7 – soil water content maintained 7 days on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; Dieback; Eucalyptus pests; Psyllidae Estresse hídrico; Pragas do eucalipto; Psyllidae; Entomologia.
Ano: 2003
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1618

The Impact of El Nino on Northeastern Forests: A Case Study on Maple Syrup Production
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Bergeron,   Nancy; Sedjo,   Roger A.
El Nino events are likely to affect maple syrup production since it is very sensitive to weather patterns. A statistically significant direct correlation has not been found in our preliminary analysis, however. This may be because many other factors affect production and because weather anomalies also occur in non-El Nino years. Few defensive activities are available to maple syrup producers to alleviate the negative impacts of weather anomalies on their production. Hence, the value of El Nino-Southern Oscillation (ENSO) forecasts to them is likely to be low, even if a clear correlation between productivity and ENSO events was eventually found. Overall, small welfare impacts of El Nino weather events are expected from their impact on the maple syrup...
Tipo: Working or Discussion Paper
Palavras-chave: El Nino; Forests; Maple syrup; Economic welfare effects; Dieback; Resource /Energy Economics and Policy; D61; Q10; Q20; Q23; N5.
Ano: 1999
URL: http://purl.umn.edu/10671

Identification, pathogenicity, and histopathology of Lasiodiplodia theobromae on mamey sapote grafts in Guerrero, México
Provedor de dados: Agrociencia
Autores: Tovar-Pedraza,Juan M.; Mora-Aguilera,José A.; Nava-Díaz,Cristian; Téliz-Ortiz,Daniel; Valdovinos-Ponce,Guadalupe; Villegas-Monter,Ángel; Hernández-Morales,Javier.
Dieback of mamey sapote (Pouteria sapota) grafts is the most important disease during vegetative propagation in commercial nurseries. In 2008, Lasiodiplodia theobromae identified by cultural, morphological and molecular characterization was associated with this disease in 97 % of necrotic rootstocks and scions samples from a nursery in Guerrero, México. The fungus was inoculated onto the binding site of El Mexicano grafted plants. Dieback symptoms and gradual drying with cracking of the bark from the apex to the base of the scion were observed 30 d after inoculation. Abundant mycelia and pycnidia were found on inoculated scions and graft union areas, in the periderm, and on leaf scars. Transverse sections of inoculated scions tissues showed pycnidia....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dieback; Nursery; Vegetative propagation; Pouteria sapota; Lasiodiplodia theobromae.
Ano: 2012
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952012000200005

Effect water activity on in vitro mycelial growth of Neofusicoccum spp. infecting blueberry
Provedor de dados: Ciencia e Investigación Agraria, Revista Latinoamericana en Ciencias de la Agricultura
Autores: Latorre,Bernardo A; Díaz,Gonzalo A; Reed,María P.
Stem canker in blueberries (Vaccinium corymbosum L.) is a disease which is widely distributed around the world and of growing importance in Chile, associated with Neofusicoccum species. The purpose of the present work was to study the effects of water activity (a w) and temperature on mycelial growth in vitro of N. arbuti, N. australe and N. parvum, obtained from blueberries with symptoms of stem canker. According to the results obtained, 25 °C was the optimum temperature for mycelial growth of N. arbuti, N. australe and N. parvum. These species presented minimal growth at 35 °C and none at 0 and 5 °C. The effect of a w on mycelial growth was significant (P&amp;#8804;0.001) and varied with the species of Neofusicoccum and the temperature. At 25 °C, the...
Tipo: Journal article
Palavras-chave: Ecological determinants; Neofusicoccum arbuti; Neofusicoccum australe; Neofusicoccum parvum; Stem canker; Dieback; Vaccinium; Water potential.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100019