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    Interactions among vegetable-infesting aphids, the fungal pathogen Metarhizium anisopliae (Ascomycota: Hypocreales) and the predatory coccinellid Cheilomenes lunata (Coleoptera: Coccinellidae)

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    Date
    2016
    Author
    Bayissa, W.
    Ekesi, S.
    Mohamed, S.
    Kaaya, G.P.
    Wagacha, M.
    Hanna, R.
    Maniania, N.K.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Entomopathogenic fungi are among biocontrol agents being considered for the control of aphids on a variety of crops. Predatory coccinellids, although generalist, are also among important natural enemies that must be conserved for aphid management. Laboratory studies were carried out to investigate the interaction between three vegetable-infesting aphids, Metarhizium anisopliae isolate ICIPE 62 and the coccinellid predator Cheilomenes lunata. At a concentration of 1 × 108 conidial ml–1, the fungus was found to cause mortality of 7.5% to C. lunata, compared to 2.5% mortality in the control at 10 days post-treatment. Female adult C. lunata to which fungus-infected aphids were offered as prey never accepted them as food source in non-choice bioassays. However, live and dead non-infected aphids were fed upon. In choice bioassay, a total of 1–3 out of 24 infected non-sporulating aphids per species (average of 0.1–0.4 aphids per arena) were consumed by 48 h-starved C. lunata within a period of 60 min, but avoided sporulating cadavers. Foraging adult C. lunata enhanced the spread of conidia of M. anisopliae from infected cadavers to fourth instars Aphis gossypii feeding on okra (0.8–15.0% mortality), Brevicoryne brassicae (3.3–15.0% mortality) and Lipaphis pseudobrassicae (0.8–14.2% mortality) on kale plants. Results of this study demonstrate compatibility between M. anisopliae and C. lunata, and could provide a sustainable strategy for effective management of aphids on crucifers and okra cropping systems.
    https://dx.doi.org/10.1080/09583157.2015.1099148
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1162
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1080/09583157.2015.1099148
    IITA Subjects
    Disease Control
    Agrovoc Terms
    Aphids; Starvation; Spread
    Regions
    Africa; East Africa
    Countries
    Kenya
    Journals
    Biocontrol Science and Technology
    Collections
    • Journal and Journal Articles4842
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