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Search for "ENTOMOPHTHORA": 25 articles found in Index.

KREJZOVÁ R. (1988): Seasonal dynamics of the formation and discharge of Entomophthora conidia in vitro.  Česká Mykologie 42(2): 105-113   (published: 10th May, 1988)
  abstract   The formation and discharge of conidia during the whole vegetation season was observed in cultures of two isolates of Conidiobolus thromboides Drechsler and one isolate of Entomophthora destruens Batko et Weiser. Individual species and often even isolates markedly differ from one another in the number of discharged conidia and in the general course of conidiation. The optimum period for conidiation was from the beginning of the season till the end of September.

KREJZOVÁ R. (1976): Record of Entomophthora (Triplosporium) fresenii (Nowakowski) Gustafsson in Czechoslovakia and its taxonimic evaluation.  Česká Mykologie 30(3-4): 207-213   (published: 1976)
  abstract   Entomophthora fresenii was found for the first time in Czechoslovakia on Aphis fabae. A new taxonomic status is proposed: Entomophthora subgen. Triplosporium stat. nov. based on morphological evidence and literature review.

KREJZOVÁ R. (1974): List of species and strains of the genus Entomophthora cultivated in the collection of theInstitute of Entomology, Czechoslovak Academy of Sciences, Prague.  Česká Mykologie 28(3): 189-190   (published: 1974)

References.  Česká Mykologie 27(2): 111   (published: 1973)
  abstract   A symposium on Armillaria mellea was held in Brno on September 28–29, 1972, organized by the Forestry Faculty of the Agricultural University and the Working Group for Forest Protection of the Czech Agricultural Academy. The first day included field trips to infected spruce, beech, hornbeam, and lime trees, showing typical symptoms and decay stages caused by the fungus. On the second day, academic lectures were given, stressing the worldwide damage by Armillaria and the lack of knowledge of its biology and ecology. The event concluded with a mushroom tasting session.

KREJZOVÁ R. (1973): The resistance of cultures and dried resting spores of three species of the genus Entomophthora to ajatin and the viability of their resting spores after long-term storage in the refrigerator.  Česká Mykologie 27(2): 107-111   (published: 1973)
  abstract   Light with an intensity of 1000 to 5000 lux inhibits the release of zoospores and the formation of zoosporangia of hop downy mildew (Peronoplasmopara humuli Miy. et Tak.). Zoosporangia release zoospores in water suspension both in light and darkness already after one hour. With increasing light intensity, however, the percentage of zoosporangia releasing zoospores decreases: after 6 hours 95% release zoospores in darkness and 72–84% in light. Light affects more sharply the onset of zoosporangia formation and the density of the mildew coating. In darkness the first zoosporangia form after 4 hours and a continuous dense coating after 12 hours. In light, depending on intensity, the first individual fruiting bodies and zoosporangia form after 6–22 hours, and their number remains nearly unchanged even after 30 hours of exposure. The inhibitory effect of light is only temporary, as the pathogen resumes forming dense, infective zoosporangia after 10–20 hours back in darkness under optimal conditions.

KREJZOVÁ R. (1971): Resistance and germinability of resting spores of some species of the Entomophthora.  Česká Mykologie 25(4): 231-238   (published: 1971)
  abstract   Resting spores of Entomophthora thaxteriana germinated after 5 years in cold storage; spores of E. virulenta and E. destruens germinated after 2 years. Spores resisted high temperatures (up to 100°C) for limited times and still retained viability. They remained viable after 18 months at –30°C.

KREJZOVÁ R. (1971): Submerse Kultivation der insektenpathogenen Pilzarten Entomophthora traxteriana (Petch) Hall et Bell und Entomophthora destruens Weiser et Batko.  Česká Mykologie 25(2): 118-124   (published: 1971)
  abstract   The fungi Entomophthora thaxteriana (Petch) Hall et Bell and Entomophthora destruens Weiser et Batko were cultivated in amino acid-rich liquid media. Yield of vegetative mass and resting spores was measured under varying pH and compared with E. virulenta. Morphological and physiological growth patterns of these Entomophthora species in submerged culture are described. Historical taxonomy and previous misidentifications of E. thaxteriana are discussed.

KREJZOVÁ R. (1970): Submerged cultivation of Entomophthora virulenta Hall et Dunn 1957.  Česká Mykologie 24(2): 87-94   (published: 20th April, 1970)
  abstract   The nutrient solutions most suitable for submerged cultivation of Entomophthora virulenta Hall et Dunn 1957 were tested for maximum vegetative growth and resting spore formation. The study evaluates historical and modern media used for isolation and cultivation, highlighting industrial needs and physiological research applications.

KUBÁTOVÁ A., DVOŘÁK L. (2005): Entomopathogenic fungi associated with insect hibernating in underground shelters.   [entomopathogenicmicromycetes, hypogeangalleries, overwinteringmoths, butter­fliesandmosquitoes]  Czech Mycology 57(3-4): 221-237   (published: 10th February, 2006)
  abstract   In the period 2001-2004, several hundreds of undergroundshelters (mainlyab and onedgalleries, caves, and cellars)inW and SWBohemia(CzechRepublic) were explored for insectcadavers with visi­ blefungalgrowth. At27localities, 94infectedcadavers of sixinsecttaxa were collected.Themostfre­ quentinfectedinsects were 7Yiphosadubitata, Scoliopteryxlibatrix(Lepidoptera;Geometridae and Noctuidae, resp.) and unidentifedmosquitoes(Diptera, Culicidae). On the collectedcadavers, alto­ ge the r20 species of microfungi(includingsterilemycelia) were recorded, most of them belonging to entomopathogens. The most frequent was Paecilomyces farinosus (36 % of all samples) and Cordycepssp.(15%)whichhadaffinitytoC. tuberculata and C.riverae. Closeassociation with insects was shownbyCordycepssp.( with Triphosadubitata) and Conidiobolusdestruens( with unidentified mosquitoes). On the contrary, Paecilomycesfarinosus was recordedonfivedifferentinsect species . Also several other interesting species were found (e.g. Hirsutella guignardii, Engyodontium cf. parvisporum), probably not yet recorded from the Czech Republic. Microphotographs of some microfungi studied are included.

STEENBERG T., EILENBERG J. (1995): Natural occurence of entomopathogenic fungi on Aphids at an agricurtural field site.   [Entomopathogenic fungi, cereal aphids, weeds, Erynia neoaphidis, Entomophthora planchoniana]  Czech Mycology 48(2): 89-96   (published: 25th September, 1995)
  abstract   The occurrence of insect pathogenic fungi on cereal aphids (Sitobion avenae, Rhopalosiphum padi and Metopolophium dirhodum) and other aphid species was studied at an agricultural field site over two years. Aphids were sampled from crops (Tricitum sativum, Avena sativa and Secale cereale) and weeds (Chenopodium album, Polygonum spp., Lamium sp., Capsella bursa-pastoris and others) and the following fungal species were documented: Erynia neoaphidis, Entomophthora planchoniana, Conidiobolus obscurus, Conidiobolus thromboides, Neozygites fresenii and Verticillium lecanii. Epizootic development from mid July onwards occurred in a population of S. avenae. The dominant fungus species in 1993 was E. neoaphidis, and in 1994 E. planchoniana. It was possible to infect S. avenae with E. neoaphidis originating from other aphid species.

FRAGNER P., MIŘEJOVSKÝ P. (1990): Key to histological identification of causative agents in systemic mycoses IV.  Česká Mykologie 44(4): 193-202   (published: 26th November, 1990)
  abstract   Based on author’s experience and data from literature the key suggests identification of microscopical fungi according to morphology of mycotic elements found in histological sections from human and animal tissues. Part IV: Concise information about species and varieties comprising remarks on occurrence and character of diseases in humans and animals, morphology of fungi in tissues and histopathological pictures. The article is concluded by a list of literature. Includes overview of Zygomycetes.

KREJZOVÁ R. (1988): The formation and discharge of conidia in cultures of entomophthorus fungi.  Česká Mykologie 42(1): 31-40   (published: 10th February, 1988)
  abstract   The formation and discharge of conidia from twenty isolates of five species of entomophthorous fungi (Conidiobolus thromboides, Entomophthora destruens, Entomophthora pyriformis, Erynia neoaphidis and Zoophthora radicans) were studied with regard to their cultivation period in vitro. With the exception of E. pyriformis, isolates with both markedly high and very low numbers of discharged conidia occurred in all species. The capacity of conidium production and discharge was not very significantly dependent upon the in vitro cultivation period of the isolate. The course of conidium formation was characteristic for individual species and often markedly differed from the others.

KREJZOVÁ R. (1987): Pathogenicity of Erynia neoaphidis for Acyrthosiphon pisum.  Česká Mykologie 41(2): 65-72   (published: 8th May, 1987)
  abstract   The mycological material from an epizootic on Acyrthosiphon pisum Harris on alfalfa was evaluated. Pathogenicity of two isolates of Erynia neoaphidis Remaudière et Hennebert 1980 was tested and compared with the pathogenicity of the same fungus applied via infected aphids. The death rate of infected aphids was primarily influenced by relative humidity, regardless of whether the fungal material came from culture or from dead infected hosts.

OTČENÁŠEK M., DVOŘÁK J. (1985): Fungi infecting man. Taxonomy of agents of human mycoses in an alphabetical survey.  Česká Mykologie 39(3): 155-164   (published: 1985)
  abstract   An orientational survey of taxonomy of fungi which have been described as agents of human mycoses is given. An alphabetical list of 163 agents contains data on synonyms of the individual species and organs afflicted by them. The literature citation of the earliest paper calling attention to pathogenicity is provided. Current nomenclature of anamorph and teleomorph stages and their mutual relation is discussed.

HUBÁLEK Z. (1981): A systematic survey of dimorphic and polymorphic fungi.  Česká Mykologie 35(4): 209-226   (published: 1981)
  abstract   Various definitions of the term dimorphism in fungi are briefly discussed and a general concept is given with a suggested morphological classification of the dimorphism. Dimorphism (and polymorphism) is delimited as an environmentally controlled reversible phenotypic duality (or plurality in the case of polymorphism) in the morphogenesis of the vegetative fungal cells, which is not restricted to pathogenic species and to the mycelial-yeast transitions only. A systematic list and an alphabetical index of the fungi exhibiting the phenomena of cellular dimorphism or polymorphism are presented.

KREJZOVÁ R. (1981): Surface structure of the fungus Zoophthora radicans.  Česká Mykologie 35(2): 57-63   (published: 15th May, 1981)
  abstract   The most distinctive characteristics of the fungus Zoophthora radicans shown in SEM micrographs are the ridges and grooves on the typical cup-like papilla of conidia, the spoon-like form of the thread-like conidiophore with anemoconidium, and finely wrinkled surface of anemoconidia. No attaching device of anemoconidia was found. The fungus was obtained from Dr. I. Hall’s laboratory, Department of Biological Control, University of California, in 1966. It was primarily isolated by Hall and Dunn (1957) from Therioaphis maculata (Buckton) and described as Entomophthora exitialis Hall et Dunn. This name was considered nomen confusum by Remaudière and Hennebert. In a revision, the authors placed the fungus definitely to Zoophthora radicans (Brefeld) Batko. The culture of the strain Z. radicans, which we obtained, grew in our collection for years on Sabouraud glucose agar or on coagulated egg yolk medium only as hyphae. In our previous experiments we managed to induce mycosis in Galleria mellonella L. larvae by an injection of suspension from cut hyphae and to obtain not only hyphal bodies, but also reproductive stages in the form of conidia. In order to complete the morphological studies of the fungus we have examined some developmental stages under the scanning electron microscope.

VINDUŠKA L. (1979): Fungi in Heterodera schachtii cysts.  Česká Mykologie 33(3): 170-175   (published: 1979)
  abstract   In 1976 and 1977 the occurrence of fungi in Heterodera schachtii Schmidt was determined. From 23.6% of cysts individual fungal species were isolated and determined. In 31.8% of cysts fungi did not occur, from 32.2% cysts bacterial colonies grew and in 12.4% of cysts mixtures of fungi and bacteria were found. From the parasitation point of view, the finding of Verticillium falcatum Petch, Cylindrocarpon destructans (Zinssmeister) Schölten, Humicola grisea Traaen, Fusarium oxysporum Schlecht, emend. Snyder et Hansen and Fusarium solani (Mart.) Appel et Wollenw. is important.

KREJZOVÁ R. (1977): Morphology and surface structure of Conidiobolus coronatus (Cost.) Batko II. Formation and germination of conidia.  Česká Mykologie 31(3): 139-141   (published: 1977)
  abstract   Conidia of Conidiobolus coronatus and their germ tubes and hyphal bodies were studied by scanning electron microscopy. This fungus was found to form these stages in a large number and wide variety, which enables it to adapt itself to the conditions of the environment. Conidiobolus coronatus is able not only to parasitize man, mammals, insects and plants, but it grows also as a saprophyte. The discharged conidia are at first highly turgid and with smooth surface. Later their surface becomes slightly undulate. The membranes of older conidia are regularly pitted or furrowed, only the papilla with its circular facets remains relatively smooth. Also the surface of germ tubes and hyphae becomes gradually furrowed due to drying and shift of protoplasm.

NOVÁK D. (1977): Ein Versuch mit Mykose in der Stechmückenbekämpfung.  Česká Mykologie 31(1): 38-40   (published: 1977)
  abstract   In the article, an experiment with the use of the mycosis Entomophthora Fres. in the control of mosquitoes (Culex pipiens L.) in a cellar is described. It appears that this method of mosquito control will have only limited efficacy.

KREJZOVÁ R. (1977): Morphology and surface of Conidiobolus coronatus (Cost.) Batko.  Česká Mykologie 31(1): 28-30   (published: 1977)
  abstract   The fungus Conidiobolus coronatus was studied by means of a scanning electron microscope. Besides conidia germinating to microconidiophores, and conidia with mature microconidia, also intermediate stages were observed in the micrographs. The conidia with microconidiophores were thus the initial stages of microconidia-producing conidia and not resting spores. The resting spores with typical three-layer envelope were not observed.

KREJZOVÁ R. (1975): Morphology and taxonomy of the species Conidiobolus coronatus (Constantin) Srinivasan et Thirumalachar (1964).  Česká Mykologie 29(3): 174-178   (published: 1975)
  abstract   Conidiobolus coronatus was isolated as an airborne contaminant in a newly built house in Prague. This species is known both as a saprophyte and a pathogen of insects and mammals, including humans. The isolate was studied morphologically and cultured on various media. Its significance for hygiene is discussed.

ONDŘEJ M. (1974): Mykofloristische Notizen I. Centrospora Neerg.  Česká Mykologie 28(3): 185-188   (published: 1974)
  abstract   The fungi of the genus Entomophthora are mostly obligate parasites in nature. Due to their high demand for organic nitrogen, they are difficult to isolate and especially to maintain in permanent culture compared to other entomopathogenic fungi. In the Prague collection, the best results were obtained using coagulated yolk medium (Müller-Kogler 1959), or media enriched with casamino acid compounds (Krejzová 1970).

SAMŠIŇÁKOVÁ A., MIŠÍKOVÁ S. (1973): Enzyme activities in certain entomophagous representative of Deuteromycetes (Moniliales) in relationships to their virulence.  Česká Mykologie 27(1): 55-60   (published: 1973)
  abstract   Extracellular secretion of chitinase, lipase, and protease was demonstrated in eleven species and strains of entomophagous fungi of the group Deuteromycetes (Moniliales). The enzymatic activity of the strains was compared with their virulence against larvae of Galleria mellonella. A correlation between enzyme production and pathogenicity was observed.

WEISER J. (1965): Notes on two new species of the genus Tarichium Cohn (Entomophthoraceae).  Česká Mykologie 19(4): 201-204   (published: 1965)
  abstract   Two new species of the genus Tarichium are described from Czechoslovakia: Tarichium pustulatum on Barathra brassicae and Tarichium gammae on Agrotis segetum and Plusia gamma. These species differ in the surface structures of the resting spore exosporium. The study also discusses the development of Tarichium species, known for lacking conidia and showing only hyphal bodies and azygospores.

BAUDYŠ E. (1957): In memoriam: RNDr. Richard Picbauer (1886-1955).  Česká Mykologie 11(1): 56-60   (published: 10th February, 1957)

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