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    Mortality of Maruca vitrata (Lepidoptera: Crambidae) larval stages induced by different doses of the entomopathogenic fungi Metarhizium anisopliae and Beauveria bassiana

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    S14ArtMehintoMortalityNothomDev.pdf (566.9Kb)
    Date
    2014
    Author
    Mehinto, J.T.
    Atachi, P.
    Douro-Kpindou, O.K.
    Dannon, E.A.
    Tamò, M.
    Type
    Journal Article
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    Abstract/Description
    Thedose-dependent mortality of second (3-4 days old),third (5-6 days old) and fourth (7-9 days old) larval instars of Marucavitrataas induced by the entomopathogenic fungal isolates, MetarhiziumanisopliaeMa 29 and BeauveriabassianaBb 115 was determined in a laboratory experiment. For each fungal isolate, five doses (0, 2x104, 2x105, 2x106and 2x107conidia/larva, respectively) were applied topically to one individual larva at the rate of 2 ?l ofan oil formulation. Observations were focused on mortality and sporulation of treated larvae. Cox regression was used to determine the lethal dose 50 (LD50). Results revealed high mortality of the third larval stage (L3) at 2 x 10?conidia for Ma 29 and Bb 115 with 49% and 96% mortality, respectively. No significant difference in mortality was observed between larval stages exposed to 2x107 conidia/ larva. The sporulation rate did not differ significantly between larval stages. Regardless of application doses, the Mean Survival Times (MSTs) of larvae were significantly different between doses for both fungal species. The lowest MSTs were recorded for the younger larvae (L2, L3) at higher doses (2x106 and 2x107 conidia/larva). Larval mortality increased with increasing dose, regardless of fungal species and larval stages, suggesting a dose-dependent response of M. vitrata larvae.
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1020
    IITA Subjects
    Disease Control
    Agrovoc Terms
    Maruca Vitrata; Metarhizium Anisopliae; Beauveria Bassiana
    Regions
    Africa; West Africa
    Countries
    Benin
    Journals
    International Journal of Advanced Research
    Collections
    • Journal and Journal Articles4835
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