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    The effects of photoperiod and light intensity on the sporulation of Brazilian and Norwegian isolates of Neozygites floridana


    Castro, Thiago and Wafula Wekesa, Vitalis and de Andrade Moral, Rafael and Garcia Borges Demétrio, Clarice and Delalibera, Italo and Klingen, Ingeborg (2013) The effects of photoperiod and light intensity on the sporulation of Brazilian and Norwegian isolates of Neozygites floridana. Journal of Invertebrate Pathology, 114 (3). pp. 230-233. ISSN 0022-2011

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    Abstract

    The objective of this study was to determine the effects of light intensity and duration (photoperiod) on the sporulation (discharge of primary conidia) and conidia germination (from non-infective primary conidia to infective capilliconidia) of Neozygites floridana isolates from Tetranychus urticae originating from Norway and Brazil. Two light intensities (40 and 208 μmol m−2 s−1), three photoperiods (24 h of continuous light (24 h D), 12 h of darkness followed by 12 h of light (12 h D: 12 h L) and 24 h of continuous darkness (24 h D)) and two temperatures (18 °C and 23 °C) were tested. The fungus produced similar amounts of primary conidia and capilliconidia at 12 h D:12 h and 24 h D, indicating that the fungus discharges almost all of its conidia during the first 12 h of darkness. Light had less of an effect on the production of primary conidia than on capilliconidia formation. At 24 h L, capilliconidia formation was significantly lower for all tested light intensities, temperatures and isolates compared to 12 h D:12 h L and 24 h D. At both light intensities, 24 h L resulted in a significantly lower capilliconidia formation for the Norwegian isolate compared to the Brazilian isolate. Our data suggest that, even though 24 h L reduced sporulation, some capilliconidia formation may occur at the low light intensities found on the underside of strawberry leaves during parts of the day as well as the top of a non-shaded strawberry leaf during the dim evening and morning hours in the tropics and during the dim, long summer days in temperate regions.

    Item Type: Article
    Keywords: Spider-mites; Tetranychus spp; Entomopathogenic fungi; Microbial control; Photoperiod; Temperature;
    Academic Unit: Faculty of Science and Engineering > Mathematics and Statistics
    Item ID: 10009
    Identification Number: https://doi.org/10.1016/j.jip.2013.08.004
    Depositing User: Rafael de Andrade Moral
    Date Deposited: 26 Sep 2018 14:56
    Journal or Publication Title: Journal of Invertebrate Pathology
    Publisher: Elsevier
    Refereed: Yes
    URI:

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