Progeny fitness determines the performance of the parasitoid Therophilus javanus, a prospective biocontrol agent against the legume pod borer

Aboubakar Souna Djibril, Bokono-Ganta Aimé Hippolyte, Ravallec Marc, Alizannon Mesmin, Srinivasan Ramasamy, Pittendrigh Barry Robert, Volkoff Anne-Nathalie, Tamo Manuele. 2021. Progeny fitness determines the performance of the parasitoid Therophilus javanus, a prospective biocontrol agent against the legume pod borer. Scientific Reports, 11:8990, 10 p.

Quartile : Q2, Sujet : MULTIDISCIPLINARY SCIENCES

Résumé : Therophilus javanus (Bhat & Gupta) is an exotic larval endoparasitoid newly imported from Asia into Africa as a classical biological control agent against the pod borer Maruca vitrata (Fabricius). The parasitoid preference for the five larval instars of M. vitrata and their influence on progeny sex ratio were assessed together with the impact of larval host age at the time of oviposition on development time, mother longevity and offspring production. In a choice situation, female parasitoids preferred to oviposit in the first three larval instars. The development of immature stages of the parasitoid was observed inside three-day-old hosts, whereby the first two larval instars of T. javanus completed their development as endoparasites and the third larval instar as ectoparasite. The development time was faster when first larval instars (two- and three-day-old) of the host caterpillars were parasitized compared to second larval instar (four-day-old). The highest proportion of daughters (0.51) was observed when females were provided with four-day-old hosts. The lowest intrinsic rate of increase (r) (0.21 ± 0.01), the lowest rate of increase (λ) (1.23 ± 0.01), and the lowest net reproductive rate (Ro) (35.93 ± 6.51) were recorded on four-day-old hosts. These results are discussed in the light of optimizing mass rearing and release strategies.

Mots-clés Agrovoc : agent de lutte biologique, parasitoïde, lutte biologique, Maruca vitrata, hôte, ectoparasite, ponte, Maruca, élevage en masse, sex ratio, cycle de développement, Braconidae

Mots-clés géographiques Agrovoc : France, Bénin, La Réunion

Mots-clés libres : Maruca vitrata, Biological Control, Solitary endoparasitoid, Life history traits, Release strategies

Agences de financement hors UE : Ambassade de France à Cotonou, Consortium of International Agricultural Research Centers, Bill and Melinda Gates Foundation

Auteurs et affiliations

• Aboubakar Souna Djibril, Université de Montpellier (FRA)
• Bokono-Ganta Aimé Hippolyte, UAC (BEN)
• Ravallec Marc, INRAE (FRA)
• Alizannon Mesmin, IITA (BEN)
• Srinivasan Ramasamy, World Vegetable Center (TWN)
• Pittendrigh Barry Robert, MSU (USA)
• Volkoff Anne-Nathalie, INRAE (FRA)
• Tamo Manuele, IITA (BEN) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/608249/)

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