Volatile Organic Compounds from Entomopathogenic and Nematophagous Fungi, Repel Banana Black Weevil (<em>Cosmopolites sordidus</em>)

Volatile Organic Compounds from Entomopathogenic and Nematophagous Fungi, Repel Banana Black Weevil (<em>Cosmopolites sordidus</em>)

Fungal Volatile Organic Compounds (VOCs) repel banana black weevil (BW), <i>Cosmopolites sordidus</i> (Germar, 1824), the key-pest of banana [<i>Musa</i> sp. (Linnaeus, 1753)]. The entomopathogens <i>Beauveria bassiana</i> (Bb1TS11) and <i>Metarhizium robert...

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Bibliographic Details
Main Authors: Ana Lozano-Soria, Ugo Picciotti, Federico Lopez-Moya, Javier Lopez-Cepero, Francesco Porcelli, Luis Vicente Lopez-Llorca
Format: Article
Language:English
Published: MDPI AG 2020-08-01
Series:Insects
Subjects:
Curculionidae
<i>Musa accuminata</i>
invasive species
pest control
biological control
VOCs
Online Access:https://www.mdpi.com/2075-4450/11/8/509
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Summary:Fungal Volatile Organic Compounds (VOCs) repel banana black weevil (BW), <i>Cosmopolites sordidus</i> (Germar, 1824), the key-pest of banana [<i>Musa</i> sp. (Linnaeus, 1753)]. The entomopathogens <i>Beauveria bassiana</i> (Bb1TS11) and <i>Metarhizium robertsii</i> (Mr4TS04) were isolated from banana plantation soils using an insect bait. Bb1TS11 and Mr4TS04 were pathogenic to BW adults. Bb1TS11, Bb203 (from infected palm weevils), Mr4TS04 and the nematophagous fungus <i>Pochonia clamydosporia</i> (Pc123), were tested for VOCs production. VOCs were identified by Gas Chromatography/Mass Spectrometry–Solid-Phase Micro Extraction (GC/MS-SPME). GC/MS-SPME identified a total of 97 VOCs in all strains tested. Seven VOCs (styrene, benzothiazole, camphor, borneol, 1,3-dimethoxy-benzene, 1-octen-3-ol and 3-cyclohepten-1-one) were selected for their abundance or previous record as insect repellents. In olfactometry bioassays, BW-starved adults in the dark showed the highest mobility to banana corm. 2-cyclohepten-1-one (C7), commercially available isomer of 3-cyclohepten-1-one, is the best BW repellent (<i>p</i> < 0.05), followed by 1,3-dimethoxy-benzene (C5). The rest of the VOCs have a milder repellency to BW. Styrene (C1) and benzothiazole (C2) (known to repel palm weevil) block the attraction of banana corm and BW pheromone to BW adults in bioassays. Therefore, VOCs from biocontrol fungi can be used in future studies to biomanage BW in the field.
ISSN:2075-4450

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