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    Pathogenicity of Beauveria bassiana, Metarhizium anisopliae and Serratia marcescens to the banana weevil Cosmopolites sordidus

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    Date
    1993
    Author
    Kaaya, GP
    Seshu‐Reddya, KV
    Kokwaro, ED
    Munyinyia, DM
    Type
    Article
    Language
    en
    Metadata
    Show full item record

    Abstract
    Two exotic fungal isolates, one of Beauveria bassiana (268–86) and another of Metarhizium anisopliae (100–82), three local isolates of B. bassiana (isolates I, II, III) and one of the entomogenous bacteria Serratia marcescens, were tested for pathogenicity against the banana weevil Cosmopolites sordidus. All four isolates of B. bassiana and the one of M. anisopliae were found to be pathogenic to third—instar larvae of C. sordidus, causing mortalities of 98–100% by 9 days post—exposure to dry fungal spores. M. anisopliae was the least pathogenic to larvae with LT50 of 4.2 days, compared to 3.5, 3.3, 3.6 and 4.0 respectively for isolates I, II, III and 268–86. B. bassiana was also pathogenic to adult C. sordidus, causing mortalities varying from 63–97% by 35 days post—exposure depending on isolate. As for larvae M. anisopliae exhibited low pathogenicity for the adult C. sordidus. In general, all the fungi tested were less pathogenic to adult weevils (LT50 = 17.5; 12.5; 8.0 and 22.0 days) for isolates I, II, III and 268–86 respectively, while isolate 100–82 failed to kill 50% of adults even by 35 days post—exposure. Incubation of dead weevils in a moist environment led to development of surface mycelia starting from intersegmental junctions. Histopathology revealed extensive destruction of internal organs by hyphae which invaded most of the organs. The LT50 for S. marcescens against C. sordidus larvae was 2.8 days. However, the bacterium did not kill adult C. sordidus even at 10 times the concentration applied on larvae.
    URI
    http://www.tandfonline.com/doi/abs/10.1080/09583159309355274#.Ub8oJdiwkbA
    http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/35152
    Citation
    Biocontrol Science and Technology Volume 3, Issue 2, 1993
    Publisher
    Uniiversity of Nairobi.
     
    School of Biological Sciences
     
    Subject
    banana weevil
    Cosmopolites sordidus
    pathogens
    Beauveria bassiana
    Metarhizium anisopliae
    Serratia marcescens
    Collections
    • Faculty of Science & Technology (FST) [4284]

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