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Search for "WEISER J.": 6 articles found.
WEISER J. (1987): Mosquito-killing activity of strains of Tolypocladium cylindrosporum and T. niveum. Česká Mykologie 41(4): 219-224 (published: 12th November, 1987)
abstract
Two new strains of Tolypocladium cylindrosporum W. Gams and one strain of T. niveum (Rostrup) Bissett from Czechoslovakia were pathogenic for larvae of Culex pipiens autogenicus. The LT₅₀ was 8 or 9 days. Lethal dose was 3×10⁵ conidia/ml for T. cylindrosporum and 2×10⁶ conidia/ml for T. niveum. Conidia of both species remained virulent in sterile water at 4°C for 6 weeks. More than 2 hours of exposure to a 4×10⁵ conidia/ml suspension caused efficient infection and death.
WEISER J. (1977): The intermediary host of the fungus Coelomomyces chironomi Rašín. Česká Mykologie 31(2): 81-90 (published: 1977)
abstract
The crustacean Heterocypris incongruens Sars (Ostracoda) is identified as the intermediary host of the fungus Coelomomyces chironomi Rašín (Blastocladiales) in Czechoslovakia. The development of the secondary thalli and formation of the zygotes in the host are described and the impact of this complicated way of transmission on the strategy of application of C. chironomi and others in biological vector control are discussed. A description of the localities with the fungus outbreak in the field is presented.
WEISER J., ŽIŽKA Z. (1974): theultrastructure of the Chytrid Coelomycidium simulii Deb. II. Division of the thallus and structures of zoospores. Česká Mykologie 28(4): 227-232 (published: 1974)
abstract
A case of disseminated, granulomatose lung aspergillosis with a hematogenic solitary mycotic metastasis in the myocardium of a female chick was described. The causative agent was Aspergillus flavus Link as demonstrated by cultivation. The microscopic picture showed changes of various age, from pyogenic granulomas to those with tuberculoid structure. The affinity of A. flavus to lung vessels, both veins and arteries, is emphasized.
WEISER J., ŽIŽKA Z. (1974): theultrastructure of the Chytrid Coelomycidium simulii Deb. I. Ultrastructure of the thalli. Česká Mykologie 28(3): 159-162 (published: 1974)
abstract
Ultrastructural study of Coelomycidium simulii thalli shows a multi-layered wall and central concentration of nuclei, mitochondria, and vacuoles. Most nuclei are in mitosis, and the nuclear membrane remains intact. Structural features are detailed, confirming distinct developmental stages in this chytrid infecting blackfly larvae.
KREJZOVÁ R., WEISER J. (1968): Stigmatomyces limnophorae Thaxter 1901 (Ascomycetes, Laboulbeniales), a new fungus for Cuba with remarks to its morphology. Česká Mykologie 22(3): 220-224 (published: 1968)
abstract
A Cuban strain of Stigmatomyces limnophorae Thaxter was studied on Limnophora arcuata. Its morphology closely resembles S. sarcophagae, later synonymized with S. limnophorae. Ascospores, ascus structure, and multiple stalks with radicoids from successive generations are described.
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.
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