La microscopia electronica aplicada al estudio de los liquenes en Venezuela

Se discute el desarrollo histórico de los estudios de los líquenes por microscopía electrónica en Venezuela. Se describen las distintas metodologías empleadas y los principales aportes que han alcanzado estos estudios. Se discute el estado actual de las investigaciones y su futuro.The historical development of lichen studies by electron microscopy in Venezuela is disscused. The various methods employed and the main results are described, and the current state of this research and its future outlined

Taxonomy and ecology of Botryosphaeria species and their anamorphs from Venezuela

The fungal genus Botryosphaeria including its anamorphs has a cosmopolitan distribution and occurs on a wide range of monocotyledonous, dicotyledonous and gymnospermous hosts, including woody twigs and branches, herbaceous leaves, stems of grasses, and even lichen thalli. These fungi give rise to a wide variety of symptoms such as shoot blights, stem cankers, fruit rots, die-back and gummosis. They are also known as saprophytes on dead or dying stems, branches or leaves of plants. In Venezuela, the following species have been reported: Lasiodiplodia theobromae (the anamorph of Botryosphaeria rhodina), Diplodia pinea. D. mutila and Dothiorella spp. However, their characterization has been based only on morphological descriptions. The most common and well characterized species. L. theobromae, is associated with pines and other hosts. The focus of the studies presented in this thesis as to survey Eucalyptus and Acacia plantations in Venezuela for the presence and influence of Botryosphaeria spp., and to characterize these fungi using morphological characteristics and DNA sequence data. I also evaluated the pathogenicity and population biology of Botryosphaeria species present in the plantations. It was anticipated that the various studies would characterize a relatively large number of Botryosphaeria species, potentially recognize new species and provide some perspective of their relative importance to the Eucalyptus growing industry. The thesis has been divided into chapters that reflect discrete units prepared for future publication. The first chapter presents a review of the relevant literature. Two chapters treat the taxonomy of the Botryosphaeria spp. collected in this study. An additional two chapters consider the population biology of the most commonly encountered species and the remaining chapter deals with the pathogenicity of these fungi to Eucalyptus. In the literature review I treat the taxonomy of Botyosphaeria, which has been the subject of much uncertainty for many years. I also briefly review recent findings related to their molecular characterization. A focus is also placed on the pathogenicity of Botyosphaeria species on various host plants and their known importance in Venezuela. The focus concerns mainly Eucalyptus spp. Surveys that formed part of this study logically gave rise to a large collection of Botryosphaeria isolates. An important component of this thesis was to characterize these fungi. This was done based on morphological characteristics and also comparisons or DNA sequence data for various gene regions known to be informative for these fungi. Lasiodiplodia theobromae (anamorph of B.rhodina), B. ribis and B. parva were studied from a population biology perspective. These fungi were chosen for study because they were the most common species encountered on Eucalyptus in Venezuela. To study populations, I made use of simple sequence repeat markers (SS R). Three populations of each of L. theobromae (Venezuela, Mexico and South Africa) and B.ribis-B. parva complex (Venezuela, Colombia and Hawaii) were analysed and the data considered in terms of population differentiation, gene now, mode of reproduction, gene and genotype diversity. In the final chapter of this thesis, I evaluated the pathogenicity or the seven Botryosphaeria species identified from Venezuela. These seven species were thus inoculated on Eucalyptus urophylla x E. grandis hybrid clones. A second series of inoculations was then carried out with the two most pathogenic fungi to determine the relative tolerance or the most important clones to infection. This thesis was conducted over a period of four years. Work was undertaken both in Venezuela and South Africa and this necessitated long periods of time away from my home University and family. Surveys were conducted in many parts of Venezuela to collect the Botryospaeria spp. of interest for latter study in South Africa. The research chapters have been completed systematically and they evolved over time. Each represents a discrete unit implying that there is some overlap, at least in the references, between them. I would like to believe that the thesis will provide a firm foundation for further studies of Botryospaeria spp. and prove valuable to the small but important Eucalyptus growing industry in Venezuela.Thesis (PhD)--University of Pretoria, 2008.Microbiology and Plant Pathologyunrestricte

El genero Coccocarpia Pers. (Ascomicetes liquenizados) en Venezuela

Nine species of the genus Coccocarpia are reported from Venezuela, including two new species from the states Mérida and Amazonas. These species are: C. culatensis sp. nov. (Andes), C. domingensis Vain., C. duidensis sp. nov. (Amazonas), C. epiphylla (Fée) Krempelh., C. erythrocardia (Müll. Arg.) L. Arvidss., C. erythroxyli (Spreng.) Swinsc. & Krog, C. imbricascens Nyl., C. palmicola (Spreng.) L. Arvidss. & D. Gall. and C. pellita (Ach.) Müll. Arg. emend. R. Sant. Descriptions, a key and comments on distribution and ecology are presented

Revision del genero Leprocaulon Nyl. ex Lamy (Lichenes Imperfecti) en Venzuela

Three species of Leprocaulon Nyl. ex Lamy are recognized in Venezuela, viz. L. microscopicum (Vill.) Gams ex D. Hawksw. (Andes, new to Venezuela), L. arbuscula (Nyl.) Nyl. (new to Amazonas; Andes) and L. congestum (Nyl.) Lamb & Ward (Andes). Special attention has been paid to the morphology and the secondary chemistry of each species. Two earlier reported species of Leprocaulon are excluded from the flora of Venezuela: L. gracilescens (Nyl.) I. M. Lamb & A. Ward is reduced to a chemical strain of L. albicans (Th. Fr.) Nyl. ex Hue, and L. pseudoarbuscula (Asah.) Lamb. & Ward is reduced to a chemical strain of L. arbuscula.En Venezuela se hallan presentes tres especies de Leprocaulon Nyl. ex Lamy: L. microscopicum (Vill.) Gams ex D. Hawksw. (Andes; nueva para Venezuela), L. arbuscula (Nyl.) Nyl. (nuevo registro para el Amazonas; Andes) y L. congestum (Nyl.) Lamb & Ward (Andes). Una atención especial se ofrece a la morfología y sobre todo a la química secundaria de cada una de las especies. Se excluyen de la flora de Venezuela dos especies de Leprocaulon registradas con anterioridad: L. gracilescens (Nyl.) I. M. Lamb & A. Ward se reduce a una raza química de L. albicans (Th. Fr.) Nyl. ex Hue., y L. pseudoarbuscula (Asah.) I. M. Lamb. & A. Ward se reduce a una raza química de L. arbuscula

Información Investigador: Mohali Castillo, Sari Ramon

Doctorado2277I - 200388 - 2005; 65 - 2003Patología Forestal, Biología Molecular relacionado a Filogenética de Hongos y Microscopia Electrónica, Micología, Fitopatología, Ultraestructura.Enero de 2006Ingeniero Forestal+58 274 2401517;+58 274 2401518Facultad de Ciencias Forestales y [email protected]

Primer reporte en Venezuela de Dothiorella dothidea como la causa de la podredumbre marron en frutos del duraznero

Artículo publicado en: FITOPATOLOGÍA VENEZOLANA. Revista oficial de la Sociedad Venezolana de Fitopatología, Vol. 7, Nº 2, [email protected], [email protected]@[email protected]

First report in Venezuela of Colletotrichum gloeosporioides (Coeolomycete) and its teleomorph Glomerella cingulata on Eucalyptus urophylla Blake and its hybrid Urograndis.

CONTENIDO Editorial. Propuesta de evaluación, acreditación e integración de la educación superior agrícola y ambiental venezolana. Propose of evaluation, accreditation and integration of the venezuelan higher education agricole and environmental. Suárez, Arlene; Rodríguez Mezerhane, Arlene y González Lanza, Rafael Artículos Primer reporte de Colletotrichum gloeosporioides (Coeolomycete) y su estado teleomórfico Glomerella cingulata sobre Eucalyptus urophylla Blake y su híbrido Urograndis en Venezuela. First report in Venezuela of Colletotrichum gloeosporioides (Coeolomycete) and its teleomorph Glomerella cingulata on Eucalyptus urophylla Blake and its hybrid Urograndis. Ely Bali, Francisca; Holmquist, Otón y Mohali C. Sari Evaluación del proceso de deforestación en tres cuencas del piedemonte lacustrino de la cordillera de Los Andes. Evaluation of the deforestation process in three watersheds of lacustrine piedmonts in the Andes mountains. Pozzobon B., Ennio N.; Hernández B., Edgar A. y Dugarte Castillo, Iván D. Evaluación financiera del primero y segundo ciclo de corta en el compartimiento 1 del lote boscoso El Dorado, Tumeremo, estado Bolívar - Venezuela. Financial evaluation of the first and second harvest in the compartment 1 of the El Dorado - Tumeremo forest lot, Bolivar State - Venezuela. Noguera L., Oscar E.; Andrade, Víctor y Carrero G., Omar E. Efecto del estrés hídrico sobre el rendimiento de tres variedades de tomate (Lycopersicon esculentum, Mill.). Drought stress effect on the yield of three varieties of tomato (Lycopersicon esculentum, Mill.). Mukandama, J. P.; González, María C. y Montilla, Eugenio Composición florística del municipio Boconó, estado Trujillo - Venezuela. Aportes preliminares para su reconocimiento y valoración. Composition floristica of municipality Boconó, Trujillo State - Venezuela. Preliminary contribution for its recognition and valorization. Dubuc de Isea, Lourdes Estudio preliminar de las propiedades mecánicas de la especie Azadirachta indica (Neem), proveniente del estado Falcón - Venezuela. Preliminary study of the mechanical properties of the species Azadirachta indica (Neem), coming from the Facon State-Venezuela. Reyes C., Elio C.; Valero, Styles W. y Garay J., Dario A. Variaciones de la composición florística en subtipos de bosque de la selva de Bajío en la Reserva Forestal Caparo, Llanos occidentales de Venezuela. Viariations on the floristic composition of forest subtypes of the selva de Bajio in the Forest Reserve Caparo, western plains of Venezuela. Kochaniewicz, Grzegorz y Plonczak Ratschiller, Miguel Andrés Selección de modelos para predecir distribuciones diamétricas en plantaciones de teca a partir de variables del Rodal con la función Weibull. Selection of models for prediction diameter distribution of teak plantations from spot variables with Weibull function. Quevedo R., Ana Mercedes; Jerez R., Mauricio y Moret, Ana Yajaira Importancia de la aplicación de las técnicas de decisión multicriterio (MCDM), en la industria forestal mecánica de Venezuela. Importance of the application of the techniques of decision multicriterio (MCDM), in the industry forest mechanics of Venezuela. Aragonés Beltrán, Pablo; García Melón, Mónica; Contreras Miranda, Wilver y Owen de Contreras, Mary E. La ecología industrial, el ecodiseño y los procesos mas limpios en la industria del mueble con madera en Venezuela. The industrial ecology, the ecodiseno and the processes clean in the industry of the piece of furniture with wood in Venezuela. Contreras Miranda, Wilver; Owen de Contreras, Mary E. y Capuz Rizo, Salvador Anatomía foliar y xilemática de Ochoterenaea colombiana Barkley. Leaf and wood anatomy of Ochoterenaea colombiana Barkley. Araque, Osmari Z. y Gámez A., Luis E. Plantaciones forestales e industrias asociadas en Venezuela. Aspectos socio-económicos. Forest plantations and associated industries in Venezuela. Socio-economic aspects. González, Ronalds; Plonczak Ratschiller, Miguel Andrés y Stock, Jürgen Evaluación de métodos de interpolación en la construcción de un modelo digital de elevación con fines hidrológicos: aplicación en una cuenca andina de montaña. Evaluation of interpolation methods in the construction of a digital model of elevation with hydrological ends: application in an Andean watershed of mountain. Pacheco A., Carlos E. y Barrios R., Alex G. Tesis Determinación de las fuentes actuales y potenciales de erosión en la cuenca media y alta del río Mucujepe, estado Mérida-Venezuela. Determination of present and potential sources of erosion in the middle and upper watersheds of the Mucujepe river, Merida State - Venezuela. Linares, Yamilet Modelado de distribuciones diamétricas en plantaciones de Teca en el área experimental Caparo, Barinas - Venezuela. Modeling diameter distributions for Teak plantations in the Caparo experimental station, Barinas State - Venezuela. Quevedo R., Ana [email protected]@[email protected] analíticosemestra

Frequently isolated microorganisms from caribbean Pine wood under water sprinkling system.

CONTENIDO Editorial. El "proyecto de manejo forestal productivo" en Venezuela. The "productive forest management project" in Venezuela. Artículos Microorganismos frecuentemente hallados en la madera de Pino caribe bajo riego por aspersión en patios de rolas. Frequently isolated microorganisms from caribbean Pine wood under water sprinkling system. Encinas, Osvaldo; Mohali C., Sari; Mora, Néstor y Villarreal, Nelson Anatomía xilemática caulinar de 14 especies de la familia Lauraceae. Wood anatomy of 14 species from Lauraceae family. León Hernández, Williams J. Lista de insectos de importancia forestal en Venezuela. Current list of forest insect of Venezuela. Briceño Vergara, Armando J. Tasas de deforestación en cuatro cuencas montañosas del occidente de Venezuela. Deforestation rates in four mountain watersheds of western Venezuela. Hernández B., Edgar A. y Pozzobon B., Ennio N. Influencia del mueble clásico en la industria del mueble contemporáneo venezolano. Present influence of classic furniture on Venezuela's furniture industry. Contreras Miranda, Wilver; Owen de Contreras, Mary E. y Rosso, Franz El Aliso, Alnus acuminata H.B.K., hospedero de dos especies de Chrysomelidae (Coleoptera) en los Andes Venezolanos. Alnus acuminata H.B.K. host of two Chrysomelidae (Coleoptera) of Venezuelan Andes. Briceño Vergara, Armando J. Estudio anatómico del leño de 56 especies de la subfamilia Papilionoideae (Leguminosae) en Venezuela. Wood anatomy of 56 species from Papilionoideae subfamily (Leguminosae) in Venezuela. Espinoza de Pernía, Narcisana y León Hernández, Williams J. Estudio anatómico de la madera e incidencias tecnológicas en 7 especies del género Protium Burm. f. (Burseraceae). Wood anatomy and technology of seven species from Pentium Furm. f. genus (Burseraceae). León Hernández, Williams J. Conceptos, fundamentos y métodos del manejo forestal en Venezuela. Concepts, fundaments and methods of the forest management in Venezuela. Plonczak Ratschiller, Miguel Andrés y Rodríguez P., Luis E. Tesis Efecto de las sales CCA sobre las propiedades físicas y mecánicas y durabilidad inducida en tableros de partículas de Pino caribe. Effect of CCA salt on physical and mechanical properties and induce durability in Pino caribe particleboard. Moreno P., Pablo A. Relación entre anatomía y propiedades físico-mecánicas de la especia Tectona grandis, proveniente de los Llanos Occidentales de Venezuela. Relationship between anatomy and physical-mechanical properties of the species Tectona grandis, coming from the western plains of Venezuela. Valero, Styles [email protected]@[email protected] analíticosemestra

Biopreservatives against blue stain fungus in Caribbean pine wood

Cepas de Trichoderma harzianum y Aspergillus sp. fueron ensayadas como agentes bioprotectores para prevenir el manchado azul de la madera de Pinus caribaea var. hondurensis. Pruebas In vitro mostraron la capacidad de estos microorganismos para inhibir el crecimiento de Lasiodiplodia theobromae y Sphaeropsis sapinea, principales hongos responsables del manchado azul de la madera de pino caribe en venezuela. Evaluaciones realizadas en muestras de madera verde inoculadas con suspensiones de esporas preparadas a partir de los hongos seleccionados mostraron un control superficial, extendiéndose a la región interna de las células de la madera de pino [email protected]@[email protected]@ula.vesemestralSeveral strains of Trichoderma harzianum and Aspergillus sp. were tested as potential biopreservatives against blue stain attack on Pinus caribaea var. hondurensis (caribbean pine) wood. In vitro tests showed good capacity to prevent the growth of Lasiodiplodia theobromae and Sphaeropsis sapinea fungus, both produce blue stain on caribbean pine wood in Venezuela. Evaluations carried out in small green wooden samples, inoculated with suspensions of spores prepared from these selected fungi, showed superficial control which extend to the internal regions of the wood cells of caribbean pine wood

Muerte regresiva en parchita causada por Lasiodiplodia theobromae en Venezuela

Artículo publicado en: FITOPATOLOGÍA VENEZOLANA. Revista oficial de la Sociedad Venezolana de Fitopatología, Vol. 8, Nº 1, [email protected], [email protected]@[email protected]@ula.v