Browsing by Author "Tosun O."

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Nosema raphidiae sp.n. (Microsporida, Nosematidae): A microsporidian pathogen of the predatory snake-fly Raphidia ophiopsis (Raphidioptera: Raphidiidae)
(2009-12-01) Yaman M.; Radek R.; Tosun O.; Ünal S.
The microsporidium Nosema raphidiae sp.n., a new pathogen of the predatory snake-fly Raphidia ophiopsis is described based on light microscopic and ultrastructural characteristics. It infects the gut of R. ophiopsis. All development stages are in direct contact with the host cell cytoplasm. Meronts with one diplokaryon are spherical or ovoid and are 3.8 to 6.2 μm. Sporonts are spherical to elongate and measure 4.2 to 6.2 μm. Diplokaryotic sporonts divide once to produce two sporoblasts which mature into spores. Sporoblasts are elongated and measure 3.2 to 5.2 μm in length. Fresh spores with nuclei arranged in a diplokaryon are oval and measure 4.13 ± 0.25 μm in length and 2.26 ± 0.19 μm in width. Spores stained with Giemsa's stain measure 3.80 ± 0.25 μm in length and 2.18 ± 0.17 μm in width. Spores have an isofilar polar filament with six or seven coils. All morphological and ultrastructural features indicate that the described microsporidium belongs to the genus Nosema. This species has been named Nosema raphidiae sp. n. after its host's genus.
Occurrence of Gregarina typographi (Apicomplexa, Gregarinidae) and Metschnikowia typographi (Ascomycota, Metschnikowiaceae) in Ips sexdentatus (Coleoptera: Curculionidae, Scolytinae) populations in Kastamonu (Turkey)
(2009-12-01) Unal S.; Yaman M.; Tosun O.; Aydin C.
In this study, Ips sexdentatus (Coleoptera: Curculionidae, Scolytinae) populations from Kastamonu (Turkey) were investigated for the occurrence of entomopathogens. Two species were encountered in the duration of this study and these were Gregarina typographi (Apicomplexa, Gregarinidae) and Metschnikowia typographi (Ascomycota, Metschnikowiaceae). Within the I. sexdentatus samples used in this study total infection rate of the pathogens G. typographi and M. typographi was calculated as 28.9%. Measurements of the Metschnikowia species identified from I. sexdentatus were, as follows: mean length 16.86±2.2 μm and mean width 2.8±0.3 μm (n = 125). The ascospores of this pathogen were characteristically needle-shaped and therefore, easily distinguishable under the light microscope. The occurrence rate for the ascomycete pathogen (M. typographi) was 3.1%. The gregarine pathogen measured 108.1-203.5 μm and was identified as Gregarina typographi. The occurrence rate for the Gregarine pathogen was 25.8%. The first report for Turkey (Kastamonu) of an ascomycete fungus, Meschnikowia typographi from the pine bark beetle Ips sexdentatus (Boerner) is given in this study. © Medwell Journals, 2009.